My team mate has a Go Pro and has used it for Paintball and Skiing. When playing paint ball he has used it on his gun on the barrel and also used the head strap and taken good footage.
If you go on you tube and type in go pro there are loads of different videos on there and also some pb ones, one on there showed on arrel shooting forward, shooting backwards and also head mounted.
These cameras are a bit pricey but like most things in life, you get what you pay for. There are also various types of brackets that you can buy seperate for different uses.
I'm hoping to get the Go Pro Hero 2 outdoor edition next week for my birthday.
**Try Ebay as they are cheaper than Amazon, or if you have anyone going to america get them to buy it there as its the same price in dollors as pounds so cheaper out there.
Phil