The results of the Developer Force Challenge are official and Wes Nolte brought home the bacon. Jon Mountjoy pried open the Salesforce piggy bank and shelled out for a brand new, shiny MacBook Pro for Wes. His winning Cookbook application has a slick UI and some really nice features. It's a great example of the type of app you can build with Force.com Sites.
Make sure you take a peek at the the other entries in the competition as well.
If you haven't checked out Wes' blog, definitely go take a look at it now as he has some great Salesforce code and examples on it.
You can start developing your next application on Force.com Sites as well. Developer accounts are free and you can get started today!