I'll let you know if I come across anything else.
I was about 5 minutes away from buying a GoPro before my friend offered me a brand new Contour HD for free. The GoPro is definitely the better unit - for mountain biking the GoPro has a chest mount which gets really good footage, and it's better with the light changes too, not to mention I was going to buy the BacPac module too, and the still photo mode rocks. Speaking of which, you should mount it to your door just behind the front wheel and set it on the 2 second photo mode. Could get some good cornering pics!