Video-How To Learn From A Peer Performance Review
I'm not a fan of peer performance reviews if they are used as replcacements for the manager to employee dialogue that should be ongoing throughout the year. That said, there's some value in getting feedback from peers and co-workers, although whether it's necessary to have it in a formalized setting within performance management is questionable.
In any event, here's a short 90 second video on how one can learn from the peer review process.