diff --git a/build.xml b/build.xml
index 99b8b6b18..3753ac6e5 100644
--- a/build.xml
+++ b/build.xml
@@ -769,6 +769,7 @@ MSIL
       <include name="scala/serializable.scala"/>
       <include name="scala/transient.scala"/>
       <include name="scala/runtime/*.scala"/>
+      <exclude name="scala/runtime/RichStringBuilder.scala"/>
     </quick>
     <property name="ilasm.infile" value="${msil.dir}/predef.msil"/>
     <property name="ilasm.outfile" value="${msil.dir}/predef.dll"/>
diff --git a/src/dotnet-library/scala/Predef.scala b/src/dotnet-library/scala/Predef.scala
index c09f5e0a2..1d461ac40 100644
--- a/src/dotnet-library/scala/Predef.scala
+++ b/src/dotnet-library/scala/Predef.scala
@@ -35,7 +35,9 @@ object Predef {
   type boolean = scala.Boolean
   type unit    = scala.Unit
 
-  @deprecated type All    = Nothing
+  /** @deprecated use <code>Nothing</code> instead */
+  @deprecated type All = Nothing
+  /** @deprecated use <code>Null</code> instead */
   @deprecated type AllRef = Null
 
   type String        = System.String
@@ -167,6 +169,7 @@ object Predef {
   implicit def booleanWrapper(x: Boolean)  = new runtime.RichBoolean(x)
 
   implicit def stringWrapper(x: String) = new runtime.RichString(x)
+  //implicit def stringBuilderWrapper(x : StringBuilder) = new runtime.RichStringBuilder(x)
 
   implicit def any2stringadd(x: Any) = new runtime.StringAdd(x)
 
diff --git a/src/dotnet-library/scala/compat/StringBuilder.scala b/src/dotnet-library/scala/compat/StringBuilder.scala
index a006e4fe1..2ce9ad178 100644
--- a/src/dotnet-library/scala/compat/StringBuilder.scala
+++ b/src/dotnet-library/scala/compat/StringBuilder.scala
@@ -34,7 +34,7 @@ final class StringBuilder(val self: StringBuffer) extends (Int => Char) with Pro
 
   def charAt(i: Int): Char = self(i)
   def apply(i: Int): Char = self(i)
-  def deleteCharAt(index: Int) = self.Remote(index, 1)
+  def deleteCharAt(index: Int) = self.Remove(index, 1)
 
   def setCharAt(i: Int, c: Char) { self(i) = c }
   def update(i: Int, c: Char) { self(i) = c }
diff --git a/src/dotnet-library/scala/runtime/RichString.scala b/src/dotnet-library/scala/runtime/RichString.scala
index 2870f1f8f..ee2bed47f 100644
--- a/src/dotnet-library/scala/runtime/RichString.scala
+++ b/src/dotnet-library/scala/runtime/RichString.scala
@@ -14,21 +14,43 @@ package scala.runtime
 
 import Predef._
 
-final class RichString(val self: String) extends Seq[Char] with Ordered[String] with Proxy {
-
-  // Ordered[String]
-  def compare(other: String) = self compareTo other
-
-  // Seq[Char]
-  def length = self.length
-  override def elements = Iterator.fromString(self)
-
-  /** Retrieve the n-th character of the string
-   *
-   *  @param   index into the string
-   *  @return  the character at position <code>index</code>.
-   */
-  def apply(n: Int) = self charAt n
+final class RichString(val self: String) extends Proxy with RandomAccessSeq[Char] with Ordered[String] {
+  override def apply(n: Int) = self charAt n
+  override def length = self.length
+  override def toString = self
+  override def mkString = self
+  override def slice(from : Int, until : Int) : RichString = {
+    val from0 = if (from < 0) 0 else from
+    val until0 = if (from >= until || from >= self.length) return new RichString("")
+                 else if (until > self.length) self.length else until 
+    new RichString(self.substring(from0, until0))
+  }
+  //override def ++ [B >: A](that: Iterable[B]): Seq[B] = {
+  override def ++[B >: Char](that : Iterable[B]) : RandomAccessSeq[B] = that match {
+  case that : RichString => new RichString(self + that.self) 
+  case that => super.++(that)
+  }
+  
+  override def take(until : Int) : RichString = slice(0, until)
+  override def drop(from : Int)  : RichString = slice(from, self.length)
+  override def startsWith[B](that : Seq[B]) = that match {
+  case that : RichString => self startsWith that.self
+  case that => super.startsWith(that)
+  }
+  override def endsWith[B](that : Seq[B]) = that match {
+  case that : RichString => self endsWith that.self
+  case that => super.endsWith(that)
+  }
+  override def indexOf[B](that : Seq[B]) = that match {
+  case that : RichString => self indexOf that.self
+  case that => super.indexOf(that)
+  }
+  override def containsSlice[B](that : Seq[B]) = that match {
+  case that : RichString => self contains that.self
+  case that => super.containsSlice(that)
+  }
+  
+  override def compare(other: String) = self compareTo other
 
   private final val LF: Char = 0x0A
   private final val FF: Char = 0x0C
diff --git a/src/library/scala/BufferedIterator.scala b/src/library/scala/BufferedIterator.scala
index 8720b6e53..bbc61616b 100644
--- a/src/library/scala/BufferedIterator.scala
+++ b/src/library/scala/BufferedIterator.scala
@@ -11,6 +11,9 @@
 
 package scala
 
+
+import Predef._
+
 /** Buffered iterators are iterators which allow to inspect the next
  *  element without discarding it.
  *