I've always had an interest in understanding temperaments. So if at a wedding I ever land up sitting next to a psychologist with an interest in temperaments, don't anyone else try and change the subject. Or talk to me...
I've looked at the Myers-Briggs stuff for some years, but at the moment I'm finding the Enneagram very helpful. If you're a bit twitchy about pentagrams and the like, this is actually a respected, widely studied approach with a long-standing Christian history. What is particularly helpful about the Enneagram is that it maps out a hopeful pathway/way forward for each temperament type.
My profiles under both systems are displayed in the links column on the far right of the screen - you can click through to sites that give more info about each system if you're interested...