Craigslist and the Wikipedia are two awesome, invaluable sites that are just teeming with obsessive and creative people. But for all the practical use you can get out of them, they're also home to some of the most excellent gems of trivia and humor that you'll find anywhere.
If you haven't already, bookmark the Best of Craigslist and the Unusual Articles collections, where people have helpfully highlighted stuff you shouldn't miss.
Such as? Well, at Wikipedia, there's the story of how "dord" got into the dictionary, and the classic "heavy metal ümlaut" article. At Craigslist? Just read for yourself (many entries are, as they say, "NSFW").