Wilton has great pages on their site that helps with some valuable cake baking information. Such as batter amounts for pan sizes, cooking times, serving guides, and a very cool page that uses diagrams to show tiered cake serving amounts and set ups for the number of guests you need to serve!
Fun Stuff: Here are some of my favorite sites, they may not all be cake related, but they are enjoyable!
A wonderful husband/wife photography team who specialize in modern lifestyle portraiture. They've taken several of the cake photos here on my site, not to mention all the stunning photos I've had them do of my 3 little girls! Dinofa Photography: www.dinofaphotography.com (the blog is the best part!)