Note: this post is from 2007, outbound links may be broken.
City Creator: create pixel cities
City Creator is a website that lets you construct a city with cool pixel-art styled building blocks.
Screenshot of the City Builder website
Drag and drop pieces from the palettes on the left onto the space on the right. Clicking on a piece brings it to the front. Arrange them to make your city. (It might help to start by adding the roads)
Currently you can build cities in 3 different themes: Medieville, Snoland and Blankton (More cities will be available later).
Visit City Creator to start building your own cities!