These are some of my favorite books on wine:

A fantastic resource for educating oneself about wine. Broad in scope, well-written and very informative, this is one of the best wine hooks I’ve read.
Windows on the World Complete Wine Course: 2009 Edition

When you just want to know everything about everything about wine, this is the book. Heavy lifting required.
The Oxford Companion to Wine, 3rd Edition

Excellent collection of wine pairing recipes you’ll want to try at home. Includes an excellent overview of the senses involved in enjoying wine and general, easy-to-grok food pairing guidelines.
Perfect Pairings: A Master Sommelier’s Practical Advice for Partnering Wine with Food