diff --git a/src/as/com/threerings/util/StreamableArrayList.as b/src/as/com/threerings/util/StreamableArrayList.as
index 5691cf4d5..8efb6dadc 100644
--- a/src/as/com/threerings/util/StreamableArrayList.as
+++ b/src/as/com/threerings/util/StreamableArrayList.as
@@ -9,6 +9,48 @@ import com.threerings.io.Streamable;
 public class StreamableArrayList extends ArrayCollection
     implements Streamable
 {
+    /**
+     * Returns the index of the specified object in this collection, using
+     * Equalable.equals() if possible.
+     */
+    public function indexOf (object :Object) :int
+    {
+        return ArrayUtil.indexOf(source, object);
+    }
+
+    /**
+     * Removes the first instance of the supplied object from this array, using
+     * Equalable.equals() to determine equality. Returns the removed object if
+     * a match was found, null otherwise.
+     */
+    public function remove (object :Object) :Object
+    {
+        return ArrayUtil.removeFirst(source, object);
+    }
+
+    /**
+     * Adds all of the elements of the supplied collection to the end of this
+     * list.
+     */
+    public function addAll (list :ArrayCollection) :void
+    {
+        for (var ii :int = 0; ii < list.length; ii++) {
+            addItem(list.getItemAt(ii));
+        }
+    }
+
+    /**
+     * Extracts and returns a sublist from this list.
+     */
+    public function subList (startIdx :int, endIdx :int) :ArrayCollection
+    {
+        var newlist :ArrayCollection = new ArrayCollection();
+        for (var ii :int = startIdx; ii <= endIdx; ii++) {
+            newlist.addItem(getItemAt(ii));
+        }
+        return newlist;
+    }
+
     // documentation inherited from interface Streamable
     public function writeObject (out :ObjectOutputStream) :void
     {