I have a gopro for video. The fisheye lens is a little weird, but the waterproof case and low cost is nice. It can take a wave, works for scubadiving, and it's really small. You can rail mount it and catch a lot of footage.
Thanks Rebel, I was wondering if these would be worth looking at. Which version do you have? I see they now have a "professional" version.
I have the cheapo base model. A lot of the higher end stuff is related to shooting in HD, but for me I don't do anything fancier than hosting on youtube or similar services, so having the really awesome definition isn't worth it to me. A lot if also based on the mounts that are included.