It's not great and it took me a while to get to it, but here's a little footage from a couple ATV races this year, taken with my helmet cam. Sorry for the crooked view!
unfortunately, Tyler, my helmet cam has been on the fritz. I found out it's battery lock was missing a tab, so it would cut off without me knowing it. I didn't get any while following you guys :[ Maybe I can get some at RFGP. I plan on getting there Friday night.