Dub,
A skydiving video helmet may be a start. SkySystems makes the sidewinder helmet that will fit several different cameras. It would allow you the potential to use something you already have. Of course there are associated costs...but the payback would be in the quality of the video. If that is not your primary concern than there are less expensive options.
http://www.skysystemsusa.com/helmets/sidewinder_2.html
You may want to discuss the field of vision/focus and stability issues that Eagle mentioned with some of videographers who shoot freefall or skydive footage as well.
my .02