I have an untitled piece at Nanoism, Ben White's webmag, which, if you haven't checked it out, is a really nice venue. They've run lots of good stuff lately, including work by Peter Schwartz and Mercedes Yardley.
They're on Twitter, too, and are oriented towards that format: texts of < 140 chars w/ no titles.
I'll confess: I wrote this short on Twitter, wondering if there'd be some kind of magical zap if i got it down to 140 chars exactly (which i did!).