Pixel City is a procedurally-generated city by Shamus Young. For the non-coders out there, this essentially means that based on a certain set of rules, a 3-D city is generated dynamically each time the program runs.- via diskursdisko
as for Crispy's link, i got it to work. There's a space there between 20081 and 223 in the link, and when copy-pasted, the copy-paste function tends to add the characters '%20' inplace of the space, which messed things up. so it you pater it in your address bar, make sure that it showes '20081223' as one unbroken string. in otherwords:
http://www.youtube.com/watch?v=_zluTvROHXA
Not to take attention away from Shamus' work, though. Awesome accomplishment for a single guy dinking around, and a pleasure to read.
http://download.introversion.co.uk/mirror/introversion/blog/20081223/test2.avi