This looks a real possibility

http://motorbikewriter.com/brisbane-iris-helmet-camera/

Nice idea...

I just wish they would make some sort of external camera that could be fastened to the outside of most any helmet... and didn't look like a mini box of cereal stuck on your helmet.

Umm, someone should tell them Sena already did it.  That's not to say I don't wish then the best of luck, but I saw the Sena version at AIMExpo.  I have a photo somewhere.