Hey,
I've found that cool code_swarm tool[0] which visualizes the history of an subversion repository. This is what we all were looking for, because it's colored, it blinks, and it moves, so I've just ran it on mediawiki trunk, r37834.
I've changed some of the old usernames to the current ones (like vibber -> brion, timstarling -> tstarling, etc) , though I think I didn't catch all of them.
The output is available as an 1024x786 h264 video[1], and there's also a small version (640x480)[2] (in which the is not that readable, though).
It all began back in 2001 with some edits by magnus to phpwiki. The big cround around Lee Daniel Crocker in June 2002 is when he started commiting the first phase3 code.
Leon
[0] http://vis.cs.ucdavis.edu/~ogawa/codeswarm/ [1] http://zaphod.leonweber.de/codeswarms/mediawiki.h264.1024x786.avi [2] http://zaphod.leonweber.de/codeswarms/mediawiki.h264.640x480.avi