Someone asked me about the Enneagram, so I thought I'd post something here, and let everyone benefit from the knowledge...
Test: (Third group down on the left)
Personality Tests and Tools
Find out what your type means: (Google also works, just type in "enneagram type x" where x is your type)
Enneagram Institute: Enneagram Testing & Training
Ediots • Index page
There are other sites out there too, these can get you started.
I've found this has much more depth and detail than MBTI. It attempts to explain things that MBTI does not.
I enjoy discussing this, so feel free to hit me up privately or here if you have questions.