Introversion, the UK games company that did Uplink, Defcon, and Darwinia, has been working on a game called Subversion that has procedurally generated cities, from terrain mapping to placing desk chairs in the offices of the buildings. http://www.introversion.co.uk/subversion/
Young's is nice, but the Subversion concept is orders of magnitude more awesome because it populates the city on the fly, as you approach. Like a fractal.
