GoPro HD here. Doesn't get better in terms of mounting options but the cost of them all adds up; chest, roll bar, bike etc. and now you can get a LCD back. It's also waterproof and pretty indestructible, theres a good reason you see them used on total wipeout, top gear and pretty much anything else filmed by the Beeb.
Need to load them on Vimeo for HD:
[video=vimeo;23129699]http://www.vimeo.com/23129699[/video]
[video=vimeo;22261964]http://www.vimeo.com/22261964[/video]