Thanks. Hadn't considered the effect of shock, vibration and dust on the camera. If I end up doing a lot of this, I'll probably spring for one of the GoPro Hero cameras which are obviously more suitable and rugged for this kind of use, but I was hoping to get some experience using what I have in hand before dropping more $$ on another camera.

If I go with body-mounting, it would seem that it would make more sense to go with a helmet mount.