The New Best Recipe
Excellent cookbook by the folks at America's Test Kitchen. Not only will you pick up many good recipes, but you'll learn a lot in the process. One of the few cookbooks that I have read cover-to-cover just for the sake of learning about recipes.
If it's a good cookbook, I hope to get a solid 3 recipes from it that I use on a semi-regular basis. I've gotten dozens out of the America's Test Kitchen cookbooks (this one in particular.)