A reasonable criticism of the Meyers-Briggs personality test, encouraging a more complete understanding of its limitations. Worth reading.

Accurate, thorough descriptions of each MBTI personality type.

Extensive Meyers-Briggs personality test, with Enneagrams tossed in for fun.

One of my favorite pages on Wikipedia -- this describes a way to look at MBTI types that highlights interaction styles and temperaments. Has strong parallels to the Insights Discovery evaluation.

large list of personality tests, including MBTI

Bronxelf totally pegs it: the internet lets introverts interact with people on their own terms.

Really creative and reasonable application of MBTI to roleplaying games. Fascinating!