[chopper]

as far as i'm aware, it depends on how much of any given story you post for critique here/elsewhere, just as the Critiques FAQ makes careful note of. i would certainly not wish to post an entire story up here.
Chronicles doesn't lay claim to any publication rights either, but as you rightly point out, most markets won't look favourably on a story that is already freely available online.
if you're posting a very rough first draft, and the story changes quite substantially on its way to a finished form, then there shouldn't - theoretically - be a problem in posting excerpts here (or on the passworded AbsoluteWrite forums, for example).

my 2p.