I don't have very many sites I frequent; my approach is more "Oh, this looks interesting!" Often I'm looking for a particular cuisine or ingredient or cooking method.
I do tend to avoid sites like allrecipes.com and cooks.com (to me, the electronic equivalent of digging a specific recipe out of a shoebox full of them). Sites I've found useful include A Year of Slow Cooking, SparkPeople's SparkRecipes, and Taste of Home.