The two best books I've read are Colin Fletcher/Chip Rawlins' "The Complete Walker IV" and Chris Townsend's "Backpacker's Handbook (4th edition.)" Both are comprehensive (to the point of exhaustion); most would not classify them as beginner fare (although the book that taught me how to backpack was the original "Complete Walker.")

The two most accessible books are by Karen Berger: Hiking and Backpacking, and Hiking Light Handbook. Nothing flashy, but good beginner tips and common sense on backpacking gear and skill (and how to lighten your pack without turning into a gram-weenie or becoming what Skurka calls "stupid light.")

Andrew Skurka and Justin Lichter's books are more hard-core ultralight. Good stuff, but not really general beginner fare, either.