I've taken many different assessment tests, some that determine my IQ, others my spacial competency, etc. However, no test can compare the the Myers Briggs test in helping understand those meta-traits and attributes that make you, well, you....
Visit this site to take the test for free:
The test itself shouldn't take longer than 10 minutes to complete, and when you're done you'll be assigned a four character "personality type". There are sixteen different personality types, and I'll eat my left hand if your jaw isn't on the floor when you read about who the Myers Briggs system thinks you are. Let me know your personality type, I'm also interested in hearing from anyone who doesn't believe the test represented their personality closely (if not spot-on!). Enjoy
BTW: Here's my test result FYI: