It's kind of fun- you enter in all the food you have on hand, and you can delete/add things as you like. Then it will display hundreds of different recipes using the items you have, or most of what you have and it will tell you "you will need "mint" or whatever. I entered in a bunch of stuff that I could think of that I always keep in the house, and currently have 2000 recipes I can make. That's hysterical.
I often need inspiration (especially when work kicks me in the @ss and I'm exhausted) so I figure I can poke around on supercook and not have to think too hard...
It's linked me to epicurious, allrecipes, recipezaar, blogs, foodgeeks. You can save recipes but that's as far as I've gotten with it.