To see code I've written recently, check out theory.org, a site with dynamical systems visualization tools. My latest project is Langton's Ant. You can see the source for a few c programs that I've written to perform factoring and other neato mathematical functions. Volvere is my VRML (Virtual Reality Modeling Language) page, where I have quite a few nifty geometrical objects. If you are working on a macintosh, you might have some use for these AppleScripts, that will perform all sorts of montonous tasks for you.