Actually, O'Reilly have 2 books, the Learning book, and the pocket reference. The Learning book isn't really much good, but Amazon currently have it at 70% off. (I really don't understand their pricing here. I got my copies at $4.95 from them, thinking it was a pricing error, but they've now only put it up to $10.48)

Manning also have one coming out that's supposed to be much better, so it might be better to wait for that.

Tony