levitated.net

Almost impossible to describe the content of this site so here is some of their own blurb.

Levitated.net contains visual poetry and science fun narrated in an object oriented graphic environment.

The sketches and applications generated as a byproduct of research are provided online as open source Flash modules.

These pages are attempting to fasten a usable structure around a continually evolving computational ecology, so that it may be observed and enjoyed by participants of the network.

More formal code and design ideas are periodically published as tangible commodities in book, paper, and printed form.

I urge you to check out their open source Flash applets. I've spent hours looking at this site and couldn't tell you my favourite interactive pieces as there are still some I haven't looked at. If you've got Macromedia's Flash MX I'm sure you'll pick up a multitude of ideas and techniques from examining the content.