Traveler IQ Challenge

I first came across this quiz sometime in late 2007. Due to its popularity, it was featured in WSJ. I like many aspects of it -- the breathlessness with which it throws the next question at us, the fact that it uses both accuracy and time to score, and also the visual count-down timer.

There are many groupings to choose from, but I usually attempt the World geography quiz. If you haven't seen it yet, you should check it out.