That dirtbike jump was Seth Ensloe (IIRC?) from Crusty Demons of Dirt. That guy is a few short of a six pack and does the most amazing and utterly inhuman jumps I have seen! I think he has a real death wish....
Taking away all the professionally shot videos, I still think that video of the dude dragging his helmet is one of the best riding videos I've seen. Those dudes are straight destroying the field on that track day.