I've been working on an alternative interface to the iPod app on the iPhone. Albums is a desktop which you can litter with your favourite / latest / prettiest CDs. You can throw them around using Chipmunk physics. The footer of the Albums website uses box2d-js & a few JQuery CSS manipulations to produce a similar effect:
http://albums-app.com/
Albums went live in the app store today. I'm working on scaling things up for the iPad now.