Slightly off-topic -- Surely you've already all seen the awesome wing-suit video, called "Grinding the Crack".  If not, you're probably the only person on the internet who hasn't seen it yet.

Either way, watch it again because it's truly amazing!
 Jeb Corliss, "Grinding The Crack"  (3:30)
 http://www.youtube.com/watch?v=rFQc7VRJowk

Back on topic -- Once you've seen that video you'll appreciate what I was getting at with this little video.
 2011 Tall Pines Rally - "SAIL"  (1:09)
 http://www.youtube.com/watch?v=7fg-9mDvd7I