I have become a fan of Factcheck.org lately. Oooh, non-partisan non-profit consumer advocacy fact checking. They even list their sources. Somebody pinch me!
Note to self. Do not say, type, or think such things around a bored cat.
ETA: I also like the CNN Political Ticker-Fact Checker, although I suspect that they get some of their info from the aforementioned site. I cannot tell, since unlike Factcheck.org, they do not list their sources for each article.