I have a GoPro2 with the wireless backpack unit on it. I mount it to my helmet or also on various points on the bike. Sometimes on the twisties I mount it on my bike facing backwards then give the remote to my wingman, Ed (not our Ed), behind me. He then runs the camera and films himself. Sometimes he runs it and films me. It's really kind of fun, but as the years go by it gets less exciting to watch and more to ride. ;-) I use them on my helmet and snowmobile in the winter as well.
I have been filming on the bike since back a ways. I mounted a digital 8 camera on my bike for trips. It is a good time to be doing this. I am very tempted to buy SuperHans's Sony for hunting...