I like the Enneagram, too ("Enneagram" because there are 9 outcomes, and a 9-sided star is called an enneagram in geometry). It's not as well known as a lot of other personality tests, but I think it's quite substantial. You can find an online test, and lots of information, at http://www.9types.com/.
The Enneagram, IMHO, provides some useful insights after one's "type" is established.
I haven't taken the test in years... used to test as a 5. I just retook it and now I am either a 4 or a 6.
EDIT: after taking both of the tests on the site, I most definitely test as a 4.
I'm curious to see what others get? I wonder if there's a correlation between Enneagram and MBTI. I suspect so, because when I was an INTP, I was also a 5, and now both of my test scores have changed to INFJ and 4.