Here's one for Dave Winer's list of fact checkers. The Associated Press has a section on the Electoral College in which it asks "Do you really understand how our electoral system works?"
The interactive system then proceeds to tell how the system works. Problem is it is wrong. The explanation claims the Constitution of the United States says that electors are selected by a popular vote in each of the states. Bzzzt! It doesn't. The Constitution hasn't changed (on this issue) for nearly a century and a half. Perhaps it would be a good time for a new fact checker. (There are probably some available from CBS who should be looking for work).