I think that anywere a user's picture shows up, it should be clickable to that persons profile. That's the way almost all community boards are setup already. Anywere you see a pic you can click it to go to the person's page or profile...
* 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!