Hey,
It is pretty easy to make one, if you have an existing digital video camera with AV input (like Samsung or Sony).
You just need to buy a good quality 12V colour video cammera, like the ones used in security systems, use some plastic piping and here you have your own Helmet camera.
It took me 2 days to build it, and the rezults are good, very good I'd say.
see the pictures:
www.seabreeze.com.au/gallery/gallery.asp?imageid=1518www.seabreeze.com.au/gallery/gallery.asp?imageid=1519Or you can spend lots of monney for a waterproof camera!
driftinnovation.com/www.jonescam.tv/www.bulletcam.com/