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.
I love Pies & Tacos for macarons.
Made some great sourdough from The Perfect Loaf.
I use supercook.com when I want to find recipes for specific ingredients.