Some of the Pro tomes mght be overkill for an at home cook but here are some of my favorites:
Escoffier Cookbook: There is a pretty good translation out there that has converted the old measurements to modern measures. If you get stuck with a direct translation it'll still work. Escoffier is especially good for learning how to make soups on the fly
La Repitoir de Cusine: Its a cheat sheet for French cooking. Can be very handy, but it is written in a culinary shorthand.
Larousse Gastromiqe: Its a cooking encyclopedia!
Anything by James Peterson: Especially buy Sauces Soups and Seafood vegetables. Those four books are incredible.
Professional Cooking by Wayne Gisslen: Its probally overkill for a home cook, but this is what I used in school, so I like it. You might prefer On Cooking mentioned in the above post.
For bread baking there is;
La Brea Bakery by Nancy Silverston
The Village Baker by Jose Ortiz
Those two should give you a pretty good overview of bread. You could also check out Peter Reinquist's books on the subject (Crust and Crumb, Bread Bakers Aprentice)
For cakes, Rose Levy Brennbaum (sp) has a really good book on the subject (The Cake Bible? Its been a while...)