I won't bore you with that discussion (though, I assure you, it is fascinating).
But, you (yes, I mean you!) should go take the test: http://http://www.humanmetrics.com/cgi-win/JTypes2.asp and come back and tell me what you came up with and whether you think it fits you or not.
I am an INTJ. Someone (with the nicest intentions, I'm sure) pointed out that one paragraph in particular was quite accurate:
Many INTJs believe that they are always right. In some INTJs, this belief is quite obvious, while in others it is more subtle. Some people may have a difficult time accepting what they see as a "superior attitude" or "snobbery". Not to imply that INTJs are snobbish, just that some people with strong Feeling preferences may perceive them that way. And some individuals simply have no interest in the theoretical pursuits which the INTJ enjoys.
Now, surely, my (hypothetical) readers, you disagree with this assessment of me?
However, by and large, I can see that the description fits. (http://www.personalitypage.com/INTJ.html)
What about you?