The internet is so totally sweet. After all, it's the source of awesomeness like CakeSpy! But if you're in the mood to learn something sweet (or savory), here's a baker's dozen foodie sites which I keep bookmarked as great resources:
BakeSpace: Connect with bakers and find some seriously sweet recipes on this social networking-for-bakers site.
Betty Crocker's Baking Recipes, Tips, and Ideas: A great resource for tips on not only baking but also technique, preparation, and storage.
Cake Central: Cake photos, message boards, decorating tips, giveaways, and more--the website's name really kind of say it all!
Epicurious Food Glossary: I could get lost in this glossary--and have, in fact, on occasion.
Foodista: Like Wikipedia for recipes.
King Arthur Flour Blog: I cannot visit this site without learning something.
Kitchen Monki: A clever cooking (and baking) tool which enables you to export your recipes (and those from other users!) to shopping lists. Sweet!
Modern Baking: This site is dedicated to professional bakers, but I find a lot of the articles and features very interesting!
Rose Levy Beranbaum: Real Baking with Rose features recipes, lore, and great baking info--also some interesting message boards.
Saveur's Baking Techniques: Step by step illustrated guides.
Serious Eats: Yes, I freelance for them. But I'd visit this site like a million times a day even if I didn't--it strikes the perfect mix of funny, newsy bits with serious food info.
What's Cooking America History of Cakes: So much awesome on just one site. I could read about the history of cakes (and all sorts of food) all day on this site, easily.