I haven't explored the forums all that much yet, but I joined because I heard that the crowd here is a bit more mature than what you might find on some of the other sites. I've been interested in personality type for a year and a half or so, and was blown away when I read the description for INFJ after doing my first test. I'm still learning and trying to memorize all the functions, though I think I have a decent understanding of the ones that apply to my type.
I'm finding it difficult to get other people I know interested in this stuff, which is really frustrating! So I'm pretty psyched to meet some different types here.
See you on the forums!