[Luyt]

You might be interested in http://skeptoid.com/episodes/4221

Today we're going to delve into the murky depths of Jungian psychology, and examine one of its most popular surviving manifestations. The Myers-Briggs test is used all over the world, and is the single most popular psychometric system, with the full formal version of the test given more than 2,000,000 times a year. But is it a valid psychological tool, is it just another pop gimmick like astrology, or is the truth somewhere in between? ...

[disruptivetech]

I think it useful for helping gauge what makes people tick, remember that people lie on a spectrum. Everyone [I know] who has been through has commented that it has provided some insight into how they work. It doesn't pigeon-hole people: after all its not a psychiatric label and simply attempts to crystallize a few key traits into a manageable form. Life is spectrum and MB gets some of these key axes right.

Wasn't it Jung that defined the extrovert and the introvert?