Flash-based image browser

http://www.coverpop.com/visco.php

This site is an interesting way of displaying lots of images. The creator also has a link to a page explaining how he built it. And on top of that, he has put up this page

http://www.krazydad.com/bestiary/

which contains a bunch of flash files exploring different kinds of physics, with explanations of how they work. Good hay.