My favorite BBQ/Grilling Books are (in no particular order):
Weber's "Charcoal Grilling: The Art Of Cooking With Live Fire"
Webers "Way to Grill".
"Legends of Texas Barbecue"- Good read and recipes.
I also like Raichlens "How to Grill" lots of good technique in there.
I am Currently Reading A.P. Lang's "Serious BBQ" and I like the read so far but have yet to try a recipe. I noticed that the recipes are detailed and have many ingredients.