Hmm. So twitter-sized fiction is one of the things that hooked me about twitter, back when I was doing my best not to use it. There are a handful of paying markets--of course they don't pay _handsomely_, but consider you're putting together a story that might be 20 words long.
Well, if you're twitfic-curious at all, I started a forum. And we won't talk about the hells I went through snapping that domain up. ;)
I've been keeping track of my twitter-pubs in a separate sidebar on my website. My latest went up on Tweet the Meat today. $1 richer, hey ;)
Right. So. If you're curious. Market info, discussions, and workshopping. :)