I usually start with Food Wishes, Serious Eats, or the New York Times. Julia Child for French food, Just One Cookbook for Japanese food. Budget Bytes when the bank account is looking a little thin. Dessert Person when I have a lot of time and want to knock the socks off my friends.
Probably not a lot of Indian cuisine fans, but my favorites are showmethecurry.com, vahrehvah.com, and Ministry of Curry, though I’m also fond of tarladalal and Manjula’s Kitchen.