We've all been there. It's Thursday night. You're racking your brain for dinner ideas. You open the refrigerator, and everything looks bland and boring. You think, "A decent meal could never materialize from this stuff!" As tempting as it is to pick up the phone and order takeout, there's a cheaper option. Sites like bigoven.com, allrecipes.com, supercook.com, and recipematcher.com allow you to enter the list of ingredients staring at you from under the fridge bulb and, voila, out pops a recipe for a meal from food that would most likely get pitched. Assuming $8 worth of food is tossed weekly, this trick saves $400 in a year.