We use the GoPro Surf hero at work. I use a custom made glove for a wrist mount to video tandem skydives. The Surf Hero has a wide angle lens that makes it incredibly easy to keep our students in frame. No view finder or LCD display but that has not proved to be an issue. GoPro has an HD model out that I hear the other skydivers are very happy with.
I am planning on taking one on my up coming climbs and maybe mount it on the bike just for kicks.
http://www.goprocamera.com/index.php?area=2&productid=7