Hi there,
waiting for to-be-released soon Pylint 1.0, I think it's worth mentionning here the release of the underlying astroid library: more info on http://www.logilab.org/blogentry/158911
I hope it may be of interest for people developping python code checkers than Pylint. I'll be there to discuss about that when I'll be back from vacation in a few weeks.
++