I recently bought the coolest world map from Amazon. It now hangs in my office and I study it everyday in attempts to overcome "Dumb American" syndrome.
To test my recent cramming, I visited this site. Sadly, the only quiz that I achieved a 100% on was Australia, and that is due only to my Australia magnet courtesy of Nad. Damn those Aussies for only having 6 states and 2 territories!!!
Check it out and see how well you do!