The camera's actually do very well on bikes, Ducati's and all. I have a Sony digital camera that just screws onto a suction mount right onto my tank. Does a great job.
But I have a lot of friends with the Go-Pro and Go-Pro Wide. GREAT camera and gives awesome video. I'll probably pick one up when my Sony eventually dies out.
http://www.goprocamera.com/index.php?area=2&productid=2
Personally, I like the camera mounted on the tank, so it shows the dash and the tilt of the bike. Also, sometimes mounted on the side fairing as well. I hate guys that mount it to the helmet, you can't really see anything or get that 'rollercoaster' type viewing.