I haven't done one of these in a while...
Dr. X's Evil Lair, from Andy Weir's mad science & roommates webcomic, Casey & Andy
The Common Commoner, a nifty thread from EN World
Gozzy's Cartographic Emporium
Panthalassic Worlds - giant world-ocean planets
Game-It-Yourself! - home of the canonical list of free print-and-play games
Quake Alley Mayhem!
41 minutes ago