Douglas Hofstadter's Gödel, Escher, Bach: An Eternal Golden Braid has been recorded as a series of video lectures for MIT's Open Courseware project.
Fractal animation videos. Tune in. Turn on. Drop in on a dripping skirling-swirling pulsating orgy of self-transforming recursive math. Some with fractal music. (Non-embedded mpeg-1 and mpeg-2 files, like God intended.)
Spore: Recursive-algorithmic-genetic art. More. With some nice videos, too. Fractal Flames. Also see: Electric Sheep, a distributed-parallel-computing genetic-algorithm eye-candy screen-saver thing. More screen-savers. Yum. (via MoFi and peacay)
Fractal Maze, one of the most evil puzzles I have ever encountered. It's documented briefly at mathpuzzle.com (scroll down a bit), which also features a smaller fractal maze.
Something to do if you've got nothing better to do with the rest of your life.
Now this is really too meta. MetaFilter's post about borrowed blogs being borrowed by borrowed blogs.