Russell Morrissey of ENWorld is a mad genius. Not only has he managed to create an empire out of D&D fandom, create his own publishing company, and find time to write rules. He also used Hexagrapher to make a map of the D&D geekdom. Each hex represents 1,000 members. The actual map is hotlinked, so you can click on something and go there. It's amusing and useful, as all things should be.