AH at studioah.com is pitting math against design. They've got some pretty advanced and experimental stuff like a Flash XML server, a Flash Psuedo 3d Engine, fractals & AI, Interactive Flash 3d experiments, the source files, design and some cool nav systems.

Not that new exactly, but Friends of Ed's companion web site of the book Flash Math Creativity also includes some pretty creative examples of math in motion. Some nice examples from the Flash Math Gallery and Keith Peters of bit-101.com who strives to keep up with the experiment-a-day schedule. Featuring fairly simple graphics, usually relying on math and scripting to build complex forms and movements.