This is on wired...a collection of several videos of 'extreme' sports. Cool stuff.. they're not actually all helmetcam, but they do all give a pretty good idea of what it's like looking at it first hand... though obviously nothing can duplicate the feeling.
http://www.wired.com/gadgetlab/2010/04/ ... am-videos/Really makes me want to get a helmet cam for snowboarding.
I admit that the biking through Rio slums started making me kinda sick from all the bouncing.