A basic facebook application. Users can use a slidebar on their profile to answer a question by selecting a number, 1 through 5. Also, friends' answers are aggregated and averaged on a regular basis (every login, or even page load) and the average is displayed on the profile as well. User's should be able to select whether the average displayed is from all their friends or sub-groups, such as by network, recently online, etc. (the usual).
It would be a nice addition to have the scroll bar change the image above it from an image of a "1" to an image of a "5" as the user moves it. This would require AJAX, I believe.
Let's get this started!