TwoFoods

This crazy-simple site lets you search for and compare two different food items side-by-side, breaking down calories, and grams of fat/protein/carbs for anything from generic eats like steak or apples, to specific dishes like chicken parm or apple pie, and even major chains' menu items -- letting you finally pin down whether it's the Baconators or the Chili Cheese Thickburgers that're making you fat.