I'll be posting up some information on the Keirsey Temperament sorter soon. It's fairly interesting. In a nutshell, it's another one of those tests that you fill out and the results tell you a bit about yourself, how you interact with other people, and gives pointers with how you can help yourself and help/understand others. The most interesting thing about this temperament sorter is that there are 4 main temperaments, but also there are 16 different types of people that you can fall under, which are loosely related to those temperaments...so it's not just "Extrovert" or "Introvert". It's quite in-depth. Something for you to chew on until I get the necessary info.
here's the website for anyone who's interested...I'm finding out right now if I'm allowed to post a self-implemented version of the sorter, so you don't have to give your email address and all that junk..etc..
The Keirsey Temperament Sorter (just to be redundant :-p )