Same here. That's where I first heard of it; my OB class in my MBA program.Myers-Briggs actually has credibility with some reputable people. I went to a leading MBA school, and I remember spending a day in one of the soft classes talking about how your M-B type affects which managerial techniques will be the most effective for you.
I usually get ENTJ, but depending on the specific variant of the test, and how I'm feeling that day, I often close to the line and occasionally on the other side of it for any of the last three letters. I always come out strongly on the E v. I side, though.I always, always land on the line between ENTJ and INTJ. I probably should take the test again: my wife's an extreme extrovert, and I suspect she's been pulling me in that direction.
I'm also very curious if RPG players have different tendencies than the general population.