Also known as Myers-Brigg,
This kind of stuff interests me and I think after taking it and reading about it, it's a good thing to know about yourself. Obviously the test isn't perfect, but I think this is one of the better ones out there.
Test here (72 Questions) -> http://www.humanmetrics.com/cgi-win/jtypes2.asp
Learn here (Brief and In-depth descriptions) -> http://www.personalitypage.com/html/high-level.html
Share yours here!