@Fullcrum: I'm surely borderline on the I/E dimension. I think ENTJ is accurate though, especially due to my preference for learning through direct experimentation. The "better mousetrap" I'm always working is my own life. I quite often sacrifice stability to make gains. Just ask Erin what it's like to live with me when I'm in experimental mode.
Earlier this month, for example, I re-adapted myself back to polyphasic sleep again. I did for a week, realized I still didn't like it enough to continue, and went back to monophasic once again. I decided not to blog about it because I really didn't want to get hundreds more emails with questions from people wanting to try it.