Sure, I'm a dog book junkie!
Karen Pryor's "Don't Shoot the Dog" is the textbook for clicker training as I understand, so that's very slanted towards positive reinforcement. It's excellent, and a really fun read, though it's theory rather than practice. It isn't really about dogs, it's about how to train anything.
"The Art of Raising a Puppy" by the Monks of New Skete is another favorite of mine. You probably won't follow their methods exactly because they do use a moderate amount of correction, but the book is beautifully written, they clearly love and understand dogs, and they have pretraining bonding exercises that are very useful.
Also, Judi Adler's "The Newfoundland Puppy: Early Care Early Training" has a detailed course to follow for training puppies, and it's all positive reinforcement. We worked through a good bit of it with Ajax and had great success with it. I think her website has been posted on Newf-net before, though I don't know what it is. It's a vanity press...you have to order directly from the author.
Those are my three favorites.
Audrey
) Both have info about getting started once the puppy is in your home.