It's next on my list as soon as I finish Culture Clash. The training center has it in the library, so I'm checking it out next week.
I guess what I was more looking for is cat behavior things like I know about dog behavior -- opposition reflex, why they jump, what looking away and yawning means. Maybe that isn't totally necessary to get the clicking down, but I thought it would be helpful.
I had a session with Scout today and by the end she was sitting. She always stretches her paws up and climbs in my lap to get at the treat in my hand, and finally I saw her hesitate when she reached up and you could almost see her thinking as she sat down, "Well, I don't know why this works, but I guess I'll give it a try." She did it three times in a row and we stopped.