ENFJ
ENFP
ENTJ
ENTP
ESFJ
ESFP
ESTJ
ESTP
INFJ
INFP
INTJ
INTP
ISFJ
ISFP
ISTJ
ISTP
Where E= extroverted, I= introverted, N= intuiting, s= sensing, f= feeling, t= thinking, j= judging, and p= perceiving.
That's the basics, the rest gets complicated.
Anyway, I'm INTJ (i.e. "the mastermind"). Here's the test: http://www.humanmetrics.com/cgi-win/jtypes2.asp, take it and tell me what you are. And do some background research, it's very interesting.
This picture might help explain the types a bit more:
