diff --git a/Makefile b/Makefile
index cec6f755f4..48bef384c3 100644
--- a/Makefile
+++ b/Makefile
@@ -8,12 +8,12 @@ JARS += third_party/colt.jar
 JARS += third_party/google-collect-1.0-rc5/google-collect-1.0-rc5.jar
 JARS += third_party/hadoop-0.20.0/hadoop-0.20.0-core.jar
 JARS += third_party/hadoop-0.20.0/lib/commons-logging-1.0.4.jar
-JARS += third_party/scalatest-1.0/scalatest-1.0.jar
-JARS += third_party/ScalaCheck-1.5.jar
+JARS += third_party/scalatest-1.2-for-scala-2.8.0.RC3-SNAPSHOT.jar
+JARS += third_party/scalacheck_2.8.0.RC3-1.7.jar
 CLASSPATH = $(subst $(SPACE),:,$(JARS))
 
-SCALA_SOURCES =  src/examples/*.scala src/scala/spark/*.scala src/scala/spark/repl/*.scala
-SCALA_SOURCES += src/test/spark/*.scala src/test/spark/repl/*.scala
+SCALA_SOURCES =  src/examples/*.scala src/scala/spark/*.scala #src/scala/spark/repl/*.scala
+SCALA_SOURCES += src/test/spark/*.scala #src/test/spark/repl/*.scala
 
 JAVA_SOURCES = $(wildcard src/java/spark/compress/lzf/*.java)
 
@@ -35,7 +35,7 @@ build/classes:
 	mkdir -p build/classes
 
 scala: build/classes java
-	$(COMPILER) -unchecked -d build/classes -classpath $(CLASSPATH) $(SCALA_SOURCES)
+	$(COMPILER) -unchecked -d build/classes -classpath build/classes:$(CLASSPATH) $(SCALA_SOURCES)
 
 java: $(JAVA_SOURCES) build/classes
 	javac -d build/classes $(JAVA_SOURCES)
diff --git a/src/examples/LocalALS.scala b/src/examples/LocalALS.scala
index 17d67b522b..a976a5e1c5 100644
--- a/src/examples/LocalALS.scala
+++ b/src/examples/LocalALS.scala
@@ -1,4 +1,5 @@
 import java.util.Random
+import scala.math.sqrt
 import cern.jet.math._
 import cern.colt.matrix._
 import cern.colt.matrix.linalg._
@@ -34,7 +35,7 @@ object LocalALS {
     //println("R: " + r)
     blas.daxpy(-1, targetR, r)
     val sumSqs = r.aggregate(Functions.plus, Functions.square)
-    return Math.sqrt(sumSqs / (M * U))
+    return sqrt(sumSqs / (M * U))
   }
 
   def updateMovie(i: Int, m: DoubleMatrix1D, us: Array[DoubleMatrix1D],
diff --git a/src/examples/LocalFileLR.scala b/src/examples/LocalFileLR.scala
index 60b4aa8fc4..988442755a 100644
--- a/src/examples/LocalFileLR.scala
+++ b/src/examples/LocalFileLR.scala
@@ -9,11 +9,11 @@ object LocalFileLR {
 
   def parsePoint(line: String): DataPoint = {
     val nums = line.split(' ').map(_.toDouble)
-    return DataPoint(new Vector(nums.subArray(1, D+1)), nums(0))
+    return DataPoint(new Vector(nums.slice(1, D+1)), nums(0))
   }
 
   def main(args: Array[String]) {
-    val lines = scala.io.Source.fromFile(args(0)).getLines
+    val lines = scala.io.Source.fromPath(args(0)).getLines()
     val points = lines.map(parsePoint _)
     val ITERATIONS = args(1).toInt
 
diff --git a/src/examples/LocalPi.scala b/src/examples/LocalPi.scala
index c83aeed40b..c61b3e53d4 100644
--- a/src/examples/LocalPi.scala
+++ b/src/examples/LocalPi.scala
@@ -1,3 +1,4 @@
+import scala.math.random
 import spark._
 import SparkContext._
 
@@ -5,10 +6,10 @@ object LocalPi {
   def main(args: Array[String]) {
     var count = 0
     for (i <- 1 to 100000) {
-      val x = Math.random * 2 - 1
-      val y = Math.random * 2 - 1
+      val x = random * 2 - 1
+      val y = random * 2 - 1
       if (x*x + y*y < 1) count += 1
     }
     println("Pi is roughly " + 4 * count / 100000.0)
   }
-}
\ No newline at end of file
+}
diff --git a/src/examples/SparkALS.scala b/src/examples/SparkALS.scala
index 2fd58ed3a5..a5d8559d7b 100644
--- a/src/examples/SparkALS.scala
+++ b/src/examples/SparkALS.scala
@@ -1,5 +1,6 @@
 import java.io.Serializable
 import java.util.Random
+import scala.math.sqrt
 import cern.jet.math._
 import cern.colt.matrix._
 import cern.colt.matrix.linalg._
@@ -36,7 +37,7 @@ object SparkALS {
     //println("R: " + r)
     blas.daxpy(-1, targetR, r)
     val sumSqs = r.aggregate(Functions.plus, Functions.square)
-    return Math.sqrt(sumSqs / (M * U))
+    return sqrt(sumSqs / (M * U))
   }
 
   def updateMovie(i: Int, m: DoubleMatrix1D, us: Array[DoubleMatrix1D],
diff --git a/src/examples/SparkHdfsLR.scala b/src/examples/SparkHdfsLR.scala
index d0400380bd..f14d48b17c 100644
--- a/src/examples/SparkHdfsLR.scala
+++ b/src/examples/SparkHdfsLR.scala
@@ -1,4 +1,5 @@
 import java.util.Random
+import scala.math.exp
 import Vector._
 import spark._
 
@@ -10,7 +11,7 @@ object SparkHdfsLR {
 
   def parsePoint(line: String): DataPoint = {
     //val nums = line.split(' ').map(_.toDouble)
-    //return DataPoint(new Vector(nums.subArray(1, D+1)), nums(0))
+    //return DataPoint(new Vector(nums.slice(1, D+1)), nums(0))
     val tok = new java.util.StringTokenizer(line, " ")
     var y = tok.nextToken.toDouble
     var x = new Array[Double](D)
@@ -39,7 +40,7 @@ object SparkHdfsLR {
       println("On iteration " + i)
       val gradient = sc.accumulator(Vector.zeros(D))
       for (p <- points) {
-        val scale = (1 / (1 + Math.exp(-p.y * (w dot p.x))) - 1) * p.y
+        val scale = (1 / (1 + exp(-p.y * (w dot p.x))) - 1) * p.y
         gradient +=  scale * p.x
       }
       w -= gradient.value
diff --git a/src/examples/SparkLR.scala b/src/examples/SparkLR.scala
index 34574f5640..71f9aea624 100644
--- a/src/examples/SparkLR.scala
+++ b/src/examples/SparkLR.scala
@@ -1,4 +1,5 @@
 import java.util.Random
+import scala.math.exp
 import Vector._
 import spark._
 
@@ -37,7 +38,7 @@ object SparkLR {
       println("On iteration " + i)
       val gradient = sc.accumulator(Vector.zeros(D))
       for (p <- sc.parallelize(data, numSlices)) {
-        val scale = (1 / (1 + Math.exp(-p.y * (w dot p.x))) - 1) * p.y
+        val scale = (1 / (1 + exp(-p.y * (w dot p.x))) - 1) * p.y
         gradient +=  scale * p.x
       }
       w -= gradient.value
diff --git a/src/examples/SparkPi.scala b/src/examples/SparkPi.scala
index 7dbadd1088..07311908ee 100644
--- a/src/examples/SparkPi.scala
+++ b/src/examples/SparkPi.scala
@@ -1,3 +1,4 @@
+import scala.math.random
 import spark._
 import SparkContext._
 
@@ -11,10 +12,10 @@ object SparkPi {
     val slices = if (args.length > 1) args(1).toInt else 2
     var count = spark.accumulator(0)
     for (i <- spark.parallelize(1 to 100000, slices)) {
-      val x = Math.random * 2 - 1
-      val y = Math.random * 2 - 1
+      val x = random * 2 - 1
+      val y = random * 2 - 1
       if (x*x + y*y < 1) count += 1
     }
     println("Pi is roughly " + 4 * count.value / 100000.0)
   }
-}
\ No newline at end of file
+}
diff --git a/src/scala/spark/ClosureCleaner.scala b/src/scala/spark/ClosureCleaner.scala
index c5663901b3..3426e56f60 100644
--- a/src/scala/spark/ClosureCleaner.scala
+++ b/src/scala/spark/ClosureCleaner.scala
@@ -84,6 +84,7 @@ object ClosureCleaner {
   }
   
   private def instantiateClass(cls: Class[_], outer: AnyRef): AnyRef = {
+    /* // TODO: Fix for Scala 2.8
     if (spark.repl.Main.interp == null) {
       // This is a bona fide closure class, whose constructor has no effects
       // other than to set its fields, so use its constructor
@@ -93,6 +94,7 @@ object ClosureCleaner {
         params(0) = outer // First param is always outer object
       return cons.newInstance(params: _*).asInstanceOf[AnyRef]
     } else {
+    */
       // Use reflection to instantiate object without calling constructor
       val rf = sun.reflect.ReflectionFactory.getReflectionFactory();
       val parentCtor = classOf[java.lang.Object].getDeclaredConstructor();
@@ -105,7 +107,9 @@ object ClosureCleaner {
         field.set(obj, outer)
       }
       return obj
+    /*
     }
+    */
   }
 }
 
diff --git a/src/scala/spark/Executor.scala b/src/scala/spark/Executor.scala
index 4cc8f00aa9..1f7f6f32fa 100644
--- a/src/scala/spark/Executor.scala
+++ b/src/scala/spark/Executor.scala
@@ -24,11 +24,13 @@ object Executor {
         // If the REPL is in use, create a ClassLoader that will be able to
         // read new classes defined by the REPL as the user types code
         classLoader = this.getClass.getClassLoader
+        /* // TODO: Fix for Scala 2.8
         val classDir = System.getProperty("spark.repl.classdir")
         if (classDir != null) {
           println("Using REPL classdir: " + classDir)
           classLoader = new repl.ExecutorClassLoader(classDir, classLoader)
         }
+        */
         Thread.currentThread.setContextClassLoader(classLoader)
         
         // Start worker thread pool (they will inherit our context ClassLoader)
diff --git a/src/scala/spark/HdfsFile.scala b/src/scala/spark/HdfsFile.scala
index 8050683f99..abc93adc74 100644
--- a/src/scala/spark/HdfsFile.scala
+++ b/src/scala/spark/HdfsFile.scala
@@ -24,7 +24,8 @@ import org.apache.hadoop.mapred.RecordReader
 import org.apache.hadoop.mapred.Reporter
 
 @serializable
-abstract class DistributedFile[T, Split](@transient sc: SparkContext) {
+abstract class DistributedFile[T: ClassManifest, Split](
+    @transient sc: SparkContext) {
   def splits: Array[Split]
   def iterator(split: Split): Iterator[T]
   def prefers(split: Split, slot: SlaveOffer): Boolean
@@ -74,7 +75,7 @@ abstract class DistributedFile[T, Split](@transient sc: SparkContext) {
     case _ => throw new UnsupportedOperationException("empty collection")
   }
 
-  def map[U](f: T => U) = new MappedFile(this, sc.clean(f))
+  def map[U: ClassManifest](f: T => U) = new MappedFile(this, sc.clean(f))
   def filter(f: T => Boolean) = new FilteredFile(this, sc.clean(f))
   def cache() = new CachedFile(this)
 
@@ -84,15 +85,15 @@ abstract class DistributedFile[T, Split](@transient sc: SparkContext) {
 }
 
 @serializable
-abstract class FileTask[U, T, Split](val file: DistributedFile[T, Split],
-  val split: Split)
+abstract class FileTask[U: ClassManifest, T: ClassManifest, Split](
+  val file: DistributedFile[T, Split], val split: Split)
 extends Task[U] {
   override def prefers(slot: SlaveOffer) = file.prefers(split, slot)
   override def markStarted(slot: SlaveOffer) { file.taskStarted(split, slot) }
 }
 
-class ForeachTask[T, Split](file: DistributedFile[T, Split],
-  split: Split, func: T => Unit)
+class ForeachTask[T: ClassManifest, Split](
+  file: DistributedFile[T, Split], split: Split, func: T => Unit)
 extends FileTask[Unit, T, Split](file, split) {
   override def run() {
     println("Processing " + split)
@@ -100,16 +101,17 @@ extends FileTask[Unit, T, Split](file, split) {
   }
 }
 
-class GetTask[T, Split](file: DistributedFile[T, Split], split: Split)
+class GetTask[T, Split](
+  file: DistributedFile[T, Split], split: Split)(implicit m: ClassManifest[T])
 extends FileTask[Array[T], T, Split](file, split) {
   override def run(): Array[T] = {
     println("Processing " + split)
-    file.iterator(split).collect.toArray
+    file.iterator(split).toArray(m)
   }
 }
 
-class ReduceTask[T, Split](file: DistributedFile[T, Split],
-  split: Split, f: (T, T) => T)
+class ReduceTask[T: ClassManifest, Split](
+  file: DistributedFile[T, Split], split: Split, f: (T, T) => T)
 extends FileTask[Option[T], T, Split](file, split) {
   override def run(): Option[T] = {
     println("Processing " + split)
@@ -121,7 +123,8 @@ extends FileTask[Option[T], T, Split](file, split) {
   }
 }
 
-class MappedFile[U, T, Split](prev: DistributedFile[T, Split], f: T => U) 
+class MappedFile[U: ClassManifest, T: ClassManifest, Split](
+  prev: DistributedFile[T, Split], f: T => U) 
 extends DistributedFile[U, Split](prev.sparkContext) {
   override def splits = prev.splits
   override def prefers(split: Split, slot: SlaveOffer) = prev.prefers(split, slot)
@@ -129,7 +132,8 @@ extends DistributedFile[U, Split](prev.sparkContext) {
   override def taskStarted(split: Split, slot: SlaveOffer) = prev.taskStarted(split, slot)
 }
 
-class FilteredFile[T, Split](prev: DistributedFile[T, Split], f: T => Boolean) 
+class FilteredFile[T: ClassManifest, Split](
+  prev: DistributedFile[T, Split], f: T => Boolean) 
 extends DistributedFile[T, Split](prev.sparkContext) {
   override def splits = prev.splits
   override def prefers(split: Split, slot: SlaveOffer) = prev.prefers(split, slot)
@@ -137,7 +141,8 @@ extends DistributedFile[T, Split](prev.sparkContext) {
   override def taskStarted(split: Split, slot: SlaveOffer) = prev.taskStarted(split, slot)
 }
 
-class CachedFile[T, Split](prev: DistributedFile[T, Split])
+class CachedFile[T, Split](
+  prev: DistributedFile[T, Split])(implicit m: ClassManifest[T])
 extends DistributedFile[T, Split](prev.sparkContext) {
   val id = CachedFile.newId()
   @transient val cacheLocs = Map[Split, List[Int]]()
@@ -173,7 +178,7 @@ extends DistributedFile[T, Split](prev.sparkContext) {
       }
       // If we got here, we have to load the split
       println("Loading and caching " + split)
-      val array = prev.iterator(split).collect.toArray
+      val array = prev.iterator(split).toArray(m)
       cache.put(key, array)
       loading.synchronized {
         loading.remove(key)
diff --git a/src/scala/spark/LocalScheduler.scala b/src/scala/spark/LocalScheduler.scala
index 35bfdde09f..b33f3c863e 100644
--- a/src/scala/spark/LocalScheduler.scala
+++ b/src/scala/spark/LocalScheduler.scala
@@ -13,7 +13,8 @@ private class LocalScheduler(threads: Int) extends Scheduler {
   
   override def waitForRegister() {}
   
-  override def runTasks[T](tasks: Array[Task[T]]): Array[T] = {
+  override def runTasks[T](tasks: Array[Task[T]])(implicit m: ClassManifest[T])
+      : Array[T] = {
     val futures = new Array[Future[TaskResult[T]]](tasks.length)
     
     for (i <- 0 until tasks.length) {
@@ -49,7 +50,7 @@ private class LocalScheduler(threads: Int) extends Scheduler {
     val taskResults = futures.map(_.get)
     for (result <- taskResults)
       Accumulators.add(currentThread, result.accumUpdates)
-    return taskResults.map(_.value).toArray
+    return taskResults.map(_.value).toArray(m)
   }
   
   override def stop() {}
diff --git a/src/scala/spark/NexusScheduler.scala b/src/scala/spark/NexusScheduler.scala
index a96fca9350..29c2011093 100644
--- a/src/scala/spark/NexusScheduler.scala
+++ b/src/scala/spark/NexusScheduler.scala
@@ -65,7 +65,7 @@ extends nexus.Scheduler with spark.Scheduler
   override def getExecutorInfo(d: SchedulerDriver): ExecutorInfo =
     new ExecutorInfo(new File("spark-executor").getCanonicalPath(), execArg)
 
-  override def runTasks[T](tasks: Array[Task[T]]): Array[T] = {
+  override def runTasks[T: ClassManifest](tasks: Array[Task[T]]) : Array[T] = {
     val results = new Array[T](tasks.length)
     if (tasks.length == 0)
       return results
diff --git a/src/scala/spark/ParallelArray.scala b/src/scala/spark/ParallelArray.scala
index 90cacf47fc..4f07a1577b 100644
--- a/src/scala/spark/ParallelArray.scala
+++ b/src/scala/spark/ParallelArray.scala
@@ -1,6 +1,6 @@
 package spark
 
-abstract class ParallelArray[T](sc: SparkContext) {
+abstract class ParallelArray[T: ClassManifest](sc: SparkContext) {
   def filter(f: T => Boolean): ParallelArray[T] = {
     val cleanF = sc.clean(f)
     new FilteredParallelArray[T](sc, this, cleanF)
@@ -8,11 +8,11 @@ abstract class ParallelArray[T](sc: SparkContext) {
   
   def foreach(f: T => Unit): Unit
   
-  def map[U](f: T => U): Array[U]
+  def map[U: ClassManifest](f: T => U): Array[U]
 }
 
 private object ParallelArray {
-  def slice[T](seq: Seq[T], numSlices: Int): Array[Seq[T]] = {
+  def slice[T: ClassManifest](seq: Seq[T], numSlices: Int): Seq[Seq[T]] = {
     if (numSlices < 1)
       throw new IllegalArgumentException("Positive number of slices required")
     seq match {
@@ -25,23 +25,23 @@ private object ParallelArray {
         (0 until numSlices).map(i => {
           val start = ((i * r.length.toLong) / numSlices).toInt
           val end = (((i+1) * r.length.toLong) / numSlices).toInt
-          new SerializableRange(
+          new Range(
             r.start + start * r.step, r.start + end * r.step, r.step)
-        }).asInstanceOf[Seq[Seq[T]]].toArray
+        }).asInstanceOf[Seq[Seq[T]]]
       }
       case _ => {
         val array = seq.toArray  // To prevent O(n^2) operations for List etc
         (0 until numSlices).map(i => {
           val start = ((i * array.length.toLong) / numSlices).toInt
           val end = (((i+1) * array.length.toLong) / numSlices).toInt
-          array.slice(start, end).toArray
-        }).toArray
+          array.slice(start, end).toSeq
+        })
       }
     }
   }
 }
 
-private class SimpleParallelArray[T](
+private class SimpleParallelArray[T: ClassManifest](
   sc: SparkContext, data: Seq[T], numSlices: Int)
 extends ParallelArray[T](sc) {
   val slices = ParallelArray.slice(data, numSlices)
@@ -53,7 +53,7 @@ extends ParallelArray[T](sc) {
     sc.runTasks[Unit](tasks.toArray)
   }
 
-  def map[U](f: T => U): Array[U] = {
+  def map[U: ClassManifest](f: T => U): Array[U] = {
     val cleanF = sc.clean(f)
     var tasks = for (i <- 0 until numSlices) yield
       new MapRunner(i, slices(i), cleanF)
@@ -72,14 +72,15 @@ extends Function0[Unit] {
 
 @serializable
 private class MapRunner[T, U](sliceNum: Int, data: Seq[T], f: T => U)
+  (implicit m: ClassManifest[U])
 extends Function0[Array[U]] {
   def apply(): Array[U] = {
     printf("Running slice %d of parallel map\n", sliceNum)
-    return data.map(f).toArray
+    return data.map(f).toArray(m)
   }
 }
 
-private class FilteredParallelArray[T](
+private class FilteredParallelArray[T: ClassManifest](
   sc: SparkContext, array: ParallelArray[T], predicate: T => Boolean)
 extends ParallelArray[T](sc) {
   val cleanPred = sc.clean(predicate)
@@ -89,7 +90,7 @@ extends ParallelArray[T](sc) {
     array.foreach(t => if (cleanPred(t)) cleanF(t))
   }
 
-  def map[U](f: T => U): Array[U] = {
+  def map[U: ClassManifest](f: T => U): Array[U] = {
     val cleanF = sc.clean(f)
     throw new UnsupportedOperationException(
       "Map is not yet supported on FilteredParallelArray")
diff --git a/src/scala/spark/Scheduler.scala b/src/scala/spark/Scheduler.scala
index 77446d3e78..27cf48e9d2 100644
--- a/src/scala/spark/Scheduler.scala
+++ b/src/scala/spark/Scheduler.scala
@@ -4,6 +4,6 @@ package spark
 private trait Scheduler {
   def start()
   def waitForRegister()
-  def runTasks[T](tasks: Array[Task[T]]): Array[T]
+  def runTasks[T](tasks: Array[Task[T]])(implicit m: ClassManifest[T]): Array[T]
   def stop()
 }
diff --git a/src/scala/spark/SerializableRange.scala b/src/scala/spark/SerializableRange.scala
deleted file mode 100644
index 5d383a40dc..0000000000
--- a/src/scala/spark/SerializableRange.scala
+++ /dev/null
@@ -1,75 +0,0 @@
-// This is a copy of Scala 2.7.7's Range class, (c) 2006-2009, LAMP/EPFL.
-// The only change here is to make it Serializable, because Ranges aren't.
-// This won't be needed in Scala 2.8, where Scala's Range becomes Serializable.
-
-package spark
-
-@serializable
-private class SerializableRange(val start: Int, val end: Int, val step: Int)
-extends RandomAccessSeq.Projection[Int] {
-  if (step == 0) throw new Predef.IllegalArgumentException
-
-  /** Create a new range with the start and end values of this range and
-   *  a new <code>step</code>.
-   */
-  def by(step: Int): Range = new Range(start, end, step)
-
-  override def foreach(f: Int => Unit) {
-    if (step > 0) {
-      var i = this.start
-      val until = if (inInterval(end)) end + 1 else end
-
-      while (i < until) {
-        f(i)
-        i += step
-      }
-    } else {
-      var i = this.start
-      val until = if (inInterval(end)) end - 1 else end
-
-      while (i > until) {
-        f(i)
-        i += step
-      }
-    }
-  }
-
-  lazy val length: Int = {
-    if (start < end && this.step < 0) 0
-    else if (start > end && this.step > 0) 0
-    else {
-      val base = if (start < end) end - start
-                 else start - end
-      assert(base >= 0)
-      val step = if (this.step < 0) -this.step else this.step
-      assert(step >= 0)
-      base / step + last(base, step)
-    }
-  }
-
-  protected def last(base: Int, step: Int): Int =
-    if (base % step != 0) 1 else 0
-
-  def apply(idx: Int): Int = {
-    if (idx < 0 || idx >= length) throw new Predef.IndexOutOfBoundsException
-    start + (step * idx)
-  }
-
-  /** a <code>Seq.contains</code>, not a <code>Iterator.contains</code>! */
-  def contains(x: Int): Boolean = {
-    inInterval(x) && (((x - start) % step) == 0)
-  }
-
-  /** Is the argument inside the interval defined by `start' and `end'? 
-   *  Returns true if `x' is inside [start, end).
-   */
-  protected def inInterval(x: Int): Boolean =
-    if (step > 0) 
-      (x >= start && x < end) 
-    else 
-      (x <= start && x > end)
-
-  //def inclusive = new Range.Inclusive(start,end,step)
-
-  override def toString = "SerializableRange(%d, %d, %d)".format(start, end, step)
-}
diff --git a/src/scala/spark/SparkContext.scala b/src/scala/spark/SparkContext.scala
index 4bfbcb6f21..c6ce06a875 100644
--- a/src/scala/spark/SparkContext.scala
+++ b/src/scala/spark/SparkContext.scala
@@ -8,10 +8,12 @@ import scala.collection.mutable.ArrayBuffer
 class SparkContext(master: String, frameworkName: String) {
   Cache.initialize()
 
-  def parallelize[T](seq: Seq[T], numSlices: Int): ParallelArray[T] =
+  def parallelize[T: ClassManifest](seq: Seq[T], numSlices: Int)
+      : ParallelArray[T] =
     new SimpleParallelArray[T](this, seq, numSlices)
 
-  def parallelize[T](seq: Seq[T]): ParallelArray[T] = parallelize(seq, 2)
+  def parallelize[T: ClassManifest](seq: Seq[T]): ParallelArray[T] =
+    parallelize(seq, 2)
 
   def accumulator[T](initialValue: T)(implicit param: AccumulatorParam[T]) =
     new Accumulator(initialValue, param)
@@ -42,16 +44,17 @@ class SparkContext(master: String, frameworkName: String) {
       val entry = iter.next
       val (key, value) = (entry.getKey.toString, entry.getValue.toString)
       if (key.startsWith("spark."))
-        props += (key, value)
+        props += key -> value
     }
     return Utils.serialize(props.toArray)
   }
 
-  def runTasks[T](tasks: Array[() => T]): Array[T] = {
+  def runTasks[T: ClassManifest](tasks: Array[() => T]): Array[T] = {
     runTaskObjects(tasks.map(f => new FunctionTask(f)))
   }
 
-  private[spark] def runTaskObjects[T](tasks: Seq[Task[T]]): Array[T] = {
+  private[spark] def runTaskObjects[T: ClassManifest](tasks: Seq[Task[T]])
+      : Array[T] = {
     println("Running " + tasks.length + " tasks in parallel")
     val start = System.nanoTime
     val result = scheduler.runTasks(tasks.toArray)
diff --git a/src/test/spark/ParallelArraySplitSuite.scala b/src/test/spark/ParallelArraySplitSuite.scala
index a1787bd6dd..222df4e071 100644
--- a/src/test/spark/ParallelArraySplitSuite.scala
+++ b/src/test/spark/ParallelArraySplitSuite.scala
@@ -81,7 +81,7 @@ class ParallelArraySplitSuite extends FunSuite with Checkers {
     val slices = ParallelArray.slice(data, 3)
     assert(slices.size === 3)
     assert(slices.map(_.size).reduceLeft(_+_) === 99)
-    assert(slices.forall(_.isInstanceOf[SerializableRange]))
+    assert(slices.forall(_.isInstanceOf[Range]))
   }
   
   test("inclusive ranges sliced into ranges") {
@@ -89,7 +89,7 @@ class ParallelArraySplitSuite extends FunSuite with Checkers {
     val slices = ParallelArray.slice(data, 3)
     assert(slices.size === 3)
     assert(slices.map(_.size).reduceLeft(_+_) === 100)
-    assert(slices.forall(_.isInstanceOf[SerializableRange]))
+    assert(slices.forall(_.isInstanceOf[Range]))
   }
 
   test("large ranges don't overflow") {
@@ -98,8 +98,8 @@ class ParallelArraySplitSuite extends FunSuite with Checkers {
     val slices = ParallelArray.slice(data, 40)
     assert(slices.size === 40)
     for (i <- 0 until 40) {
-      assert(slices(i).isInstanceOf[SerializableRange])
-      val range = slices(i).asInstanceOf[SerializableRange]
+      assert(slices(i).isInstanceOf[Range])
+      val range = slices(i).asInstanceOf[Range]
       assert(range.start === i * (N / 40), "slice " + i + " start")
       assert(range.end   === (i+1) * (N / 40), "slice " + i + " end")
       assert(range.step  === 1, "slice " + i + " step")
@@ -117,7 +117,7 @@ class ParallelArraySplitSuite extends FunSuite with Checkers {
         val n = tuple._2
         val slices = ParallelArray.slice(d, n)
         ("n slices"    |: slices.size == n) &&
-        ("concat to d" |: Array.concat(slices: _*).mkString(",") == d.mkString(",")) &&
+        ("concat to d" |: Seq.concat(slices: _*).mkString(",") == d.mkString(",")) &&
         ("equal sizes" |: slices.map(_.size).forall(x => x==d.size/n || x==d.size/n+1))
     }
     check(prop)
@@ -134,8 +134,8 @@ class ParallelArraySplitSuite extends FunSuite with Checkers {
       case (d: Range, n: Int) =>
         val slices = ParallelArray.slice(d, n)
         ("n slices"    |: slices.size == n) &&
-        ("all ranges"  |: slices.forall(_.isInstanceOf[SerializableRange])) &&
-        ("concat to d" |: Array.concat(slices: _*).mkString(",") == d.mkString(",")) &&
+        ("all ranges"  |: slices.forall(_.isInstanceOf[Range])) &&
+        ("concat to d" |: Seq.concat(slices: _*).mkString(",") == d.mkString(",")) &&
         ("equal sizes" |: slices.map(_.size).forall(x => x==d.size/n || x==d.size/n+1))
     }
     check(prop)
@@ -152,8 +152,8 @@ class ParallelArraySplitSuite extends FunSuite with Checkers {
       case (d: Range, n: Int) =>
         val slices = ParallelArray.slice(d, n)
         ("n slices"    |: slices.size == n) &&
-        ("all ranges"  |: slices.forall(_.isInstanceOf[SerializableRange])) &&
-        ("concat to d" |: Array.concat(slices: _*).mkString(",") == d.mkString(",")) &&
+        ("all ranges"  |: slices.forall(_.isInstanceOf[Range])) &&
+        ("concat to d" |: Seq.concat(slices: _*).mkString(",") == d.mkString(",")) &&
         ("equal sizes" |: slices.map(_.size).forall(x => x==d.size/n || x==d.size/n+1))
     }
     check(prop)
diff --git a/third_party/ScalaCheck-1.5.jar b/third_party/ScalaCheck-1.5.jar
deleted file mode 100644
index 629b26c69d..0000000000
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diff --git a/third_party/nexus.jar b/third_party/nexus.jar
index 3c0b10ed62..17cf0c18eb 100644
Binary files a/third_party/nexus.jar and b/third_party/nexus.jar differ
diff --git a/third_party/scalacheck_2.8.0.RC3-1.7.jar b/third_party/scalacheck_2.8.0.RC3-1.7.jar
new file mode 100644
index 0000000000..ac9687fc00
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diff --git a/third_party/scalatest-1.0/LICENSE b/third_party/scalatest-1.0/LICENSE
deleted file mode 100644
index d645695673..0000000000
--- a/third_party/scalatest-1.0/LICENSE
+++ /dev/null
@@ -1,202 +0,0 @@
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-
-   5. Submission of Contributions. Unless You explicitly state otherwise,
-      any Contribution intentionally submitted for inclusion in the Work
-      by You to the Licensor shall be under the terms and conditions of
-      this License, without any additional terms or conditions.
-      Notwithstanding the above, nothing herein shall supersede or modify
-      the terms of any separate license agreement you may have executed
-      with Licensor regarding such Contributions.
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-   6. Trademarks. This License does not grant permission to use the trade
-      names, trademarks, service marks, or product names of the Licensor,
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-      whether in tort (including negligence), contract, or otherwise,
-      unless required by applicable law (such as deliberate and grossly
-      negligent acts) or agreed to in writing, shall any Contributor be
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diff --git a/third_party/scalatest-1.0/NOTICE b/third_party/scalatest-1.0/NOTICE
deleted file mode 100644
index a405cbd58a..0000000000
--- a/third_party/scalatest-1.0/NOTICE
+++ /dev/null
@@ -1,7 +0,0 @@
-================================================================================
-==    NOTICE file corresponding to section 4(d) of the Apache License,        ==
-==    Version 2.0, in this case for the ScalaTest distribution.               ==
-================================================================================
-
-  - This product includes software developed by
-    Artima, Inc. (http://www.artima.com/).
diff --git a/third_party/scalatest-1.0/README.txt b/third_party/scalatest-1.0/README.txt
deleted file mode 100644
index d505b9c640..0000000000
--- a/third_party/scalatest-1.0/README.txt
+++ /dev/null
@@ -1,58 +0,0 @@
-ScalaTest 1.0
-
-ScalaTest is a free, open-source testing toolkit for Scala and
-Java programmers.  Because different developers take different approaches to creating
-software, no single approach to testing is a good fit for everyone. In light of
-this reality, ScalaTest is designed to facilitate different styles of testing. ScalaTest
-provides several traits that you can mix together into whatever combination makes you feel the most productive.
-For some examples of the various styles that ScalaTest supports, see:
-
-http://www.artima.com/scalatest
-
-GETTING STARTED
-
-To learn how to use ScalaTest, please
-open in your browser the scaladoc documentation in the
-/scalatest-1.0/doc directory. Look first at the documentation for trait
-org.scalatest.Suite, which gives a decent intro. All the other types are
-documented as well, so you can hop around to learn more.
-org.scalatest.tools.Runner explains how to use the application. The
-Ignore class is written in Java, and isn't currently shown in the Scaladoc.
-
-To try it out, you can use ScalaTest to run its own tests, i.e., the tests
-used to test ScalaTest itself. This command will run the GUI:
-
-scala -classpath scalatest-1.0.jar org.scalatest.tools.Runner -p "scalatest-1.0-tests.jar" -g -s org.scalatest.SuiteSuite
-
-This command will run and just print results to the standard output:
-
-scala -classpath scalatest-1.0.jar org.scalatest.tools.Runner -p "scalatest-1.0-tests.jar" -o -s org.scalatest.SuiteSuite
-
-ScalaTest 1.0 was tested with Scala version 2.7.5.final, so it is not
-guaranteed to work with earlier Scala versions.
-
-ABOUT SCALATEST
-
-ScalaTest was written by Bill Venners, George Berger, Josh Cough, and
-other contributors starting in late 2007.  ScalaTest, which is almost
-exclusively written in Scala, follows and improves upon the Java code
-and design of Artima SuiteRunner, a testing tool also written
-primarily by Bill Venners, starting in 2001. Over the years a few
-other people contributed to SuiteRunner as well, including:
-
-Mark Brouwer
-Chua Chee Seng
-Chris Daily
-Matt Gerrans
-John Mitchel
-Frank Sommers
-
-Several people have helped with ScalaTest, including:
-
-Corey Haines
-Colin Howe
-Dianne Marsh
-Joel Neely
-Jon-Anders Teigen
-Daniel Watson
-
diff --git a/third_party/scalatest-1.0/scalatest-1.0-tests.jar b/third_party/scalatest-1.0/scalatest-1.0-tests.jar
deleted file mode 100644
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diff --git a/third_party/scalatest-1.0/scalatest-1.0.jar b/third_party/scalatest-1.0/scalatest-1.0.jar
deleted file mode 100644
index ae7c1c7f17..0000000000
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diff --git a/third_party/scalatest-1.2-for-scala-2.8.0.RC3-SNAPSHOT.jar b/third_party/scalatest-1.2-for-scala-2.8.0.RC3-SNAPSHOT.jar
new file mode 100644
index 0000000000..f5c4af19b0
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