Wow. XKCD has done it again. Behold the United Shapes.
The United States of Craigslist Posters - This is a pretty awesome map made up of all the areas available on Craigslist
Fascinating Maps Made From Regional Foods
Haarlem - www.floorrieder.nl
California Grizzly Bear maps.
Map of online communities.
THIS IS SO COOL
The United States of Scary Things
Martin Haake - Map of South America