I'm really enjoying Adam Perry Lang's new book, Serious Barbecue. Like any good Q book, it comes from a particular perspective: in this case, a four-star chef who discovered Q and fell in love. His quest is to learn everything he can about barbecue (he's been all over the country), combine that with everything else he knows about cooking, and take it all to the next level.
As you might expect, most of his recipes are on the high-maintenance side -- but worth it.
The book is a joy to read because he doesn't just tell you what to do, he explains why it works. There's a whole section on the architecture of marinades, rubs, glazes, etc that's worth the price of admission.
He maintains this teaching style throughout the book -- including all the recipes, which is great. It's the kind of book you can read cover to cover, use as a reference, or just turn to for inspiration.