I have a used Contour HD 720p that comes with the helmet mounting accessory and a 16gb sd card. I have the original box it came in as well, but I am the 3rd owner of the camera.
Hogs,yep lots of wind noise. The most common modification to these cameras are to add a mini jack to the bottom of the camera so you can put an external mic routed in the helmet or other out of the way place.
Yes, also they just released the 1080p version as well as a GPS enabled version.