I am a software developer, game designer, project manager, and startup enthusiast. I don't spend too much time logged into Stackoverflow, but I think it's great. I was a cofounder at MokaSocial.
Q&A for professional and enthusiast programmers
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Q&A for professional programmers interested in conceptual questions about software development
Q&A for enthusiasts and power users of the Android operating system
Q&A for system and network administrators
Q&A for those who study the creation and solving of puzzles