Facebook Application Logbook Sold on eBay
This is the first Facebook application put out by this company called Nothing Original and it sold on eBay (see listing here) for $2500, called Logbook. It makes use of the Amazon affiliate program along with Google Adsense, and allows Facebook users to add movies, books, and music to their reviewed items. This should open the door for more applications like it, and it certainly can't make MySpace feel very comfortable. There doesn't actually seem to be a whole lot of other information about this application and it is the only app the company has put out, but it did sell for $2500 so that should say something about the sales opportunities for these types of applications.
Other information from Nothing Original's information: