Here's an online quiz that's worth taking (well, if you're a GEEK like me): Intergalactic Explorer Personality Type Test. Like Myers-Briggs, but different. Swiped from the generally pretty wonderful Weblog Wannabe.
(I'm a "QEMR - Scientist," I guess. Which doesn't seem quite accurate, but then on a lot of questions I could've gone either way. I tend to end up on the fence in most personality-type quizzes.)