Web - Geekipedia

Geekipedia is Wired Magazine's fun encyclopedia, for geeks (with a twist).

Most techie topics/personalities are covered, going from Artificial intelligence to Web 2.0 - You can suggest an entry if you think they've missed out on something important (I was surprised to see they mentioned World of Warcraft but not SL)

As described on the homepage: "Godwin's law, Guitar Hero, Gates Foundation — you may know their definitions, but we tell you what they really mean."

Check it out here.