I've learned a lot from Martin Evening's book and his treatment of the Develop module, but still I feel like if he had made it three times longer, it still wouldn't be sufficient. Part of that is because there is sooooo much power in Lightroom's develop module that maybe you can't cover every possibility with any reasonable sized chapter. Still, I can't get past the feeling that Evening (who is a professional photographer and I am not) sees things in the photos that I don't see, and he makes changes that aren't noticeable to me; or he chooses tools to use and provides only a cursory explanation why he chose that tool, and a longer explanation would have been much more helpful (for example on p. 295 where he uses Tone Range split point adjustments to achieve an effect, but its not really clear how he knew to make those specific adjustments).
So like I said, I did learn a lot. He does go through a few examples in quite a bit of detail (and in particular, I liked that he shows how he Develops an image that has a lot of highlights and a lot of shadow and not much in between). I just get the feeling that I have a whole lot more to learn about the develop module.