Practical Paleo
This book is highly recommended when approaching the Paleo diet. It's less of a recipe book and more of a dynamic instruction manual for eating and maintaining a Paleo lifestyle. The first half is loaded with information regarding how to get started with things and some of the reasoning behind Paleo. It goes over what you should eat, what you should avoid, and why. This is an all encompassing book/manual/guide and well worth the money even if you're not pursuing the Paleo diet.