Websites of Knowledge?
AvantLegion asks: "Every now and then, I stumble upon a website that is just a veritable tome of knowledge - be it of a certain theme (like Snopes.com) or more general information (Everything2.com). Free documentation databases are invaluable, but rarely seem to come up very early in Google searches. What websites out there do you consider to be indispensable sources of knowledge? (save the obvious Slashdot jokes). Where do you look up information besides combing through search engine results?"
The Straight Dope
They've got a good search engine, and answers to all kinds of interesting questions. I've spent many an evening browsing through the archives...