Recipematcher.com is a recipe website where you enter in all the ingredients you have and you can then search for recipes that use those ingredients (the results are sorted by which recipes require you to buy the least numbers of ingredients). It's a great idea. Too bad that updating the list of ingredients you have on hand is a major pain in the ass. I filled it out quickly and for some things I checked off the box even though I didn't have it because it's something that I have no problem buying or having extra around. Like onions, tomato sauce, or chicken breasts. I don't any of those around right now but I have no problem buying them because they will easily get used up.
The one great thing this website could be useful for is finding recipes that use ingredients I want to get rid of. It is always satisfying to get rid of an ingredient that I've had in the cupboard for months. There's no way I'm going to update this website's list of ingredients I have on hand though. I may just tweak it by adding some ingredient that I want to get rid of and then using their search option that finds recipes that MUST contain a specific ingredient. I am not so sure how useful this is as Google can pretty much too the same thing and probably has access to more recipes than this website does. I have used this Cookin' With Google form in the past. There's also Google Base Recipes, which currently contains 1.12 million recipes.