
Alton Brown's
I'm Just Here for More Food. It's the baking book I'd wanted all my life without knowing it.
Also invaluable is Harold McGhee's
On Food and Cooking. You might enjoy
Cookwise by Sherry O'Corihher. Anything from the Cook's Illustrated people (including/especially the magazine) will be of interest to you. I am a big fan of their books
Baking Illustrated and
The Dessert Bible. I also enjoy Jeffrey Steingarten's books. Not every article he writes offers insight into baking, but many do and they're a hoot and a half regardless.