Great book for learning to use GIMP

I've been using GIMP for a couple of years now, but very blindly, and because of that to perform only very rudimentary tasks like cropping pictures. So when I discovered the book/manual, Grokking the GIMP recently, I was very excited. Particularly since I found the book very well-written, and very enjoyable to read.

And... the book can be read for free online. Don't you just love free stuff?

I've written a review (with info on where to find the book online) and published it on hubpages:
A Novice's Review: Grokking the GIMP by Carey Bunks