Oh, I'm reminded of one other interesting thing I've seen twitter used for, though I haven't tried it yet myself: fiction. There's Othar (from Girl Genius)'s Twitter, if you haven't already seen that one, where he casually relates snippets of his wacky steampunk adventures. That sort of IC fiction can be pretty interesting. And a friend of mine uses one of his Twitter accounts, monkeylimit, for tiny little snippets of delicious fiction, no more than 140 characters long.

...now I'm pondering the use of Twitter for those sort of sub-drabble microfiction uses. Darnit! I don't need another account...