There are quite a few personality tests you can take on the Similar Minds personality tests page. All the ones that I looked at had a similar setup -- you rank a list of statements on a five-point scale from "very inaccurate" to "very accurate", according to how well they describe you. I took the "Short Test" under the "Percentile Tests" category. One of the statements was "I am ambivalent", so I marked the midpoint of the scale, meaning "it's about 50/50." I don't think the testing instrument got the joke, though.
There is also a category devoted to Enneagram tests. Similar minds defines the Enneagram as "a nine factor personality system that is sort of a historical mutt, many different influences. The nine factors are - orderliness, helpfulness, image focus, hypersensitivity, detachment, caution, adventurousness, strength, and calmness. " Needless to say, I find the reduction of each of our nine types to a single "factor" a bit, well, reductive.
One interesting test is the Enneagram "Word Test", which reminded me of the WEPSS.
There are also some Enneagram tests under the "Compatibility Tests" category. The multi user test requires you to coordinate with a friend, so, since Mary Beth is out of town, I put the two of us into the self-reporting test. It correctly pegged us as a 5 and a 6, and said we are 73% similar and 73% complementary, which, as you may remember from geometry class, are not the same thing. No word yet as to our actual compatibility as friends.
When Mary Beth returns, I have a proposal regarding how to create a holistic Enneagram test. I figure there is about a 73% chance she will want to work on it.