Your next meal could be served up by BigOven's new API. The comprehensive service for those who like to cook provides more than 170,000 recipes in XML or JSON format (our BigOven API profile). From there, you can display it however you want, though there's a yet to be determined fee for commercial applications.
It's always exciting to see those outside the web industry using an API to improve their sites. NY Times First Look blog has a great example of what Dallas Public Library has done with the Best Sellers API.