diff --git a/app/SwingWorker.java b/app/SwingWorker.java
new file mode 100644
index 000000000..1b2c46464
--- /dev/null
+++ b/app/SwingWorker.java
@@ -0,0 +1,129 @@
+import javax.swing.SwingUtilities;
+
+/**
+ * This is the 3rd version of SwingWorker (also known as
+ * SwingWorker 3), an abstract class that you subclass to
+ * perform GUI-related work in a dedicated thread.  For
+ * instructions on and examples of using this class, see:
+ * 
+ * http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html
+ *
+ * Note that the API changed slightly in the 3rd version:
+ * You must now invoke start() on the SwingWorker after
+ * creating it.
+ */
+public abstract class SwingWorker {
+    private Object value;  // see getValue(), setValue()
+
+    /** 
+     * Class to maintain reference to current worker thread
+     * under separate synchronization control.
+     */
+    private static class ThreadVar {
+        private Thread thread;
+        ThreadVar(Thread t) { thread = t; }
+        synchronized Thread get() { return thread; }
+        synchronized void clear() { thread = null; }
+    }
+
+    private ThreadVar threadVar;
+
+    /** 
+     * Get the value produced by the worker thread, or null if it 
+     * hasn't been constructed yet.
+     */
+    protected synchronized Object getValue() { 
+        return value; 
+    }
+
+    /** 
+     * Set the value produced by worker thread 
+     */
+    private synchronized void setValue(Object x) { 
+        value = x; 
+    }
+
+    /** 
+     * Compute the value to be returned by the <code>get</code> method. 
+     */
+    public abstract Object construct();
+
+    /**
+     * Called on the event dispatching thread (not on the worker thread)
+     * after the <code>construct</code> method has returned.
+     */
+    public void finished() {
+    }
+
+    /**
+     * A new method that interrupts the worker thread.  Call this method
+     * to force the worker to stop what it's doing.
+     */
+    public void interrupt() {
+        Thread t = threadVar.get();
+        if (t != null) {
+            t.interrupt();
+        }
+        threadVar.clear();
+    }
+
+    /**
+     * Return the value created by the <code>construct</code> method.  
+     * Returns null if either the constructing thread or the current
+     * thread was interrupted before a value was produced.
+     * 
+     * @return the value created by the <code>construct</code> method
+     */
+    public Object get() {
+        while (true) {  
+            Thread t = threadVar.get();
+            if (t == null) {
+                return getValue();
+            }
+            try {
+                t.join();
+            }
+            catch (InterruptedException e) {
+                Thread.currentThread().interrupt(); // propagate
+                return null;
+            }
+        }
+    }
+
+
+    /**
+     * Start a thread that will call the <code>construct</code> method
+     * and then exit.
+     */
+    public SwingWorker() {
+        final Runnable doFinished = new Runnable() {
+           public void run() { finished(); }
+        };
+
+        Runnable doConstruct = new Runnable() { 
+            public void run() {
+                try {
+                    setValue(construct());
+                }
+                finally {
+                    threadVar.clear();
+                }
+
+                SwingUtilities.invokeLater(doFinished);
+            }
+        };
+
+        Thread t = new Thread(doConstruct);
+        threadVar = new ThreadVar(t);
+    }
+
+    /**
+     * Start the worker thread.
+     */
+    public void start() {
+        Thread t = threadVar.get();
+        if (t != null) {
+            t.start();
+        }
+    }
+}
diff --git a/build/macosx/dist/Processing.app/Contents/Resources/pde.icns b/build/macosx/dist/Processing.app/Contents/Resources/pde.icns
new file mode 100644
index 000000000..214b19877
Binary files /dev/null and b/build/macosx/dist/Processing.app/Contents/Resources/pde.icns differ
diff --git a/core/PGraphics.java b/core/PGraphics.java
index d960d2288..e909dc1ea 100644
--- a/core/PGraphics.java
+++ b/core/PGraphics.java
@@ -23,6 +23,42 @@
   Boston, MA  02111-1307  USA
 */
 
+/*
+
+if depth buffer sorting turned on?
+
+with depth(), stroke() *or* fill() but not both
+
+
+point
+  depth
+    strokeWeight < 2
+      rough single pixel dot with a z value
+        rgb
+        rgba
+    strokeWeight >= 2
+      round endcap
+        rough filled circle with a z value
+          rgb
+          rgba
+      square endcap
+        rough filled square with a z value
+          rgb
+          rgba
+  noDepth
+    strokeWeight < 2
+      rough single pixel dot (no z value)
+    strokeWeight >= 2
+
+
+quad
+  depth
+    strokeWeight < 2
+      series of single pixel lines that surround
+    strokeWeight >= 2
+
+*/
+
 package processing.core;
 
 import java.applet.*;