diff --git a/src/as/com/threerings/util/StringBuilder.as b/src/as/com/threerings/util/StringBuilder.as
new file mode 100644
index 000000000..820cbe4d0
--- /dev/null
+++ b/src/as/com/threerings/util/StringBuilder.as
@@ -0,0 +1,33 @@
+package com.threerings.util {
+
+public class StringBuilder
+{
+    public function StringBuilder (... args)
+    {
+        _array = args;
+    }
+
+    /**
+     * Append all arguments to the end of the string being built
+     * and return this StringBuilder.
+     */
+    public function append (... args) :StringBuilder
+    {
+        while (args.length > 0) {
+            _array.push(args.shift());
+        }
+        return this;
+    }
+
+    /**
+     * Return the String built so far.
+     */
+    public function toString () :String
+    {
+        return _array.join("");
+    }
+
+    /** Our array in which we place all arguments. */
+    protected var _array :Array;
+}
+}