King Arthur Flour Whole Grain Baking: Delicious Recipes Using Nutritious Whole Grains It's my current baking bible. This cookbook shows you how to get whole grains (wheat but also oats, corn, spelt, rye, and more) into nearly every baked good.
The King Arthur Flour Baker's Companion: The All-Purpose Baking Cookbook Even though the original has less focus on whole grains, it's still a great resource for learning baking technique and for reliable recipes.
The New Best Recipe: All-New Edition All the recipes come with accompanying articles explaining the testing that went into the development, so you can understand why the recipe works.
The Best Vegetable Recipes (Best Recipe Classics) The recipes may rely a bit too heavily on cream and butter, but it's a great resource for learning how to prepare veggies you may never have touched before.
I'm Just Here for the Food: Version 2.0 I have the first edition (and it's signed!). Alton Brown picks apart all the basic techniques for applying heat to food (i.e., cooking).