I just added a feature request on the forge. In brosing the others I've found some that I submitted that need to be closed now but I can't figure out how to close them. Must be a higher level user I suppose.
* LIKE thumbs up system for "liking" content items
* Karma - CB user rating system
* Golf Score Tracker
* Jitter - status update system. "What's on your mind?"
* CB Author Plug - Shows CB author link and avatar in content items. J1.5 compatible and very customizable!