Funny map of online communities in the style of a D&D map

The awesome geeky net-comic XKCD has a great new installment up — a "Map of online communities and related points of interest: geographic area represents estimated size of membership." It's all in the style of a parchment D&D campaign map, and full of sly in-jokes


(Thanks to everyone who suggested this!)

See also:
Geeky comic about chess and roller-coasters
Pi joke
Geeky comic strip uses Cory as the punchline
Ironic Internet malapropism grid
Nerd humor about Katamari Damacy
Sarcastic comic about computational linguistics (and emo kids)