The Red Bull rampage is a MTB freeride event which takes place every couple of years. Similar in format to those free-ski comps where skiers have to find the best line down the mountain face, only with rock instead of snow.
Anyway, this was the trick that won it for Cam Zink, a 360 down a sizable drop. I believe it measured 50ft out, 40ft down, lip to landing. Oh and he's on a full downhill rig. Fairly nuts.