Some suggestions other than books are online forums. Weber has one that relates to their "WSM Smoker", which is a very good smoker from beginner to advanced. Lots of good advice, recipes, hints, etc on there. Also Addicted to BBQ website along with Primo grills and smoker's website. I use all three of them for what I do. I've had a homebuilt smoker, a brinkmann, a traeger, and currently use a primo. My 2 cents.
http://tvwbb.infopop.cc/eve/forums
http://primogrillforum.com/forums/
http://addictedtobbq.proboards.com/index.cgi