I have a GoPro HD camera and I love it. I need to get a new lens kit because I believe I scratched the heck out of it somehow, but the video quality is awesome. The suction cup mount is rediculously sturdy.
I still have a difficult time with wind noise, but I think that has more to do with my car's exhaust system being completely stock, and the sound isn't loud enough to overpower the wind noise when the camera is mounted outside the car.
Anyway, I'm looking into buying a second camera and borrowing my friend's GoPro when we make the trip to C5Fest2