http://www.gamedev.net/community/forums/topic.asp?topic_id=5...
But this - http://www.planetside.co.uk/terragen - is.
This guy is currently doing a series on procedural generation of a city terrain, and it's the same deal. It's not going to win awards for "teh aw3som3st cty evar!", it's that you don't often see someone do something like this while posting reasons, dead-end experiments, and other such commentary.
It's less awesome to look at, but radically superior as an article to read and learn from.
However, the rendered results do look relatively nice, and the article (even as awfully paginated as it is) gives a pretty good idea on how to get there from zero.