At the Lunch sponsored by Google today Matt Cutts confirmed the recent rumors about media bot results getting into Big Daddy. Matt said it is a bandwidth saving feature to have GoogleBot and MediaBot both contributing to big daddy. Matt also stated that you will gain zero advantage in search listings however if you are serving different content to MediaBot then to Googlebot then you could be in trouble.
Greg Boser I think was the first to See it , Nice fing greg !!