I'm Bethy, and I have recently (two months ago) discovered my INFJ preferences. I was first introduced to the MBTI by a former boss who was providing me with some career counseling. He thought he had my type pegged already (ISTJ - his main evidence for this was that I had studied German and was good at auditing files. Heh.) but advised me to take the test on my own. I took a free online version (I think it was the Humanmetrics one) and came out INFP. Which is what I thought I was, until I had one of those Aha!-moments and realized that Introverted Feeling was not my forte. So I sprung for the real MBTI, came out INFJ, and had that verified (both self and with a counselor). So here I am.
The first book I read on the subject was Keirsey's Please Understand Me II (which is a different theory, I know. And I didn't find his profiles and descriptions very helpful - he simultaneously idealizes and denigrates NFs to an insane degree). I just finished Isabel Briggs Myers' Gifts Differing, which I found very interesting. Kroeger and Thuesen's Type Talk was okay, but it dealt too much in stereotypes (P's do this, F's do that, etc). The writers I have found most helpful have been Berens and Nardi. I've read their book The Sixteen Types, and I hope to read more of them soon.
And there you have my type background. I'm looking forward to posting with you all!