I meant to post a link to this last week after PZ Myers mentioned it, but then I wanted to try taking the test first which meant my post got delayed and then forgotten about for a few days. If you haven't already had a look at the Risk Intelligence test, though, I think it is worth going to (as far as internet intelligence tests go). The basic idea of the test is that you don't simply answer every statement with a True/False response, but rather with a percentage - 50% meaning you have no idea and think the statement as equally likely to be true or false, 100% meaning you are certain it is true, and 0% meaning you are certain it is false. There are 10% increments in between for all of those pesky facts that you are pretty sure you've heard somewhere else, but you wouldn't bet anything much of value on.
I scored a 78 - apparently that is a rather good score, but not as good as PZ Myer's 83. It would seem that I lack confidence in my responses (judging by the response curve given at the end). Of course, I don't know how much stock to place in any internet quiz, but I still thought it was an interesting project. Plus, whoever put it on seems to be gathering data, so you might be helping out someone's research by taking the test.