my story is very similar to ^'s. I was googling for documentation and ended up in here. The quality of the docs quickly got my attention. This is exactly what I was looking for, good documentation for intermediate users. There's quite a lot of docs for both beginners and experts otherwise.
I signed up for the forums, not because I have a particular learning goal, but rather because other communities out there, simply put, don't cut it, because of the reason I stated above.
I also check the book and I want to buy it. I believe it's still useful even though it's 6 years old, nut before I order it, is there any plans for a new edition?