I just joined. I wrote an essay ("Confessions of an Introvert") about being introverted (I'm INTP - "architect" works for me as I'm a web site developer). I've read a lot of books about both Enneagrams and Meyers-Briggs. My latest favorites are "The Happy Introvert" and "Are You My Type, Am I Yours?" I was thinking about checking out "The Beethoven Enneagram" by the same author, but using music to illustrate it. If you've heard it, please let me know what you thought about it. Thanks!