Supercook

If you want to surf the internet in a semi-productive way -- but not so productive that you actually have to leave the house -- then check out Supercook.

Here's how it works: You tell it which ingredients you have in stock in your home, and it'll give you a big list of recipes you can make using just those ingredients. It's a fun way to stay thrifty, clean out the fridge, and make sure food doesn't go to waste.