[dsfyu404ed]

$50 cameras do the job well enough although they're probably not weatherproof enough for use a motorcycle with some sort of enclosure.

[soylentcola]

I know a few people who use Mobius cameras or newer mini-cams on their helmets. They usually have some sort of snap-on or strap to hold them in place but also allow for removal if you get caught in the rain.

Lower profile than strapping a GoPro to your head and cheaper too.