Seems David Lu does some interesting work, like this Phone Dial Web Browser for instance. Ouch! Rotary dial? IP address only? Meh!
This electronic etch-a-sketch simply named Etch is another (apparently) frivolous project.
On the other hand, 3D XML Viewer (requires Flash Player) is an amazing 3D, graph-based visual representation of XML documents. Reminds me of TheBrain. Now this is something useful.