All my videos are with the GoPro HD Hero Motorsports edition. I'm thinking I need the GoPro 2 Motorsports.
Comes with a suction cup rated to ~130mph and plenty of 3M sticky mounts that you can permanently put on your bike or helmet if you really want to do that. I personally do not.
I also bought the 'Chesty' chest harness which mounts the camera right between your pectoral man boobs.
I've used it on everything from whitewater rafting, cliff diving, trail running, and of course motorcycling.
I definitely recommend picking up at least two SDHC Class 10 (at least class 8) in case one goes defunk and you lose all your awesome video 500 miles from home.
Slow is smooth, smooth is fast.