http://nytimes.com ran an article about one of the forerunners in what is formally called wingsuit diving, Jeb Corliss. Mr. Corliss came to wingsuit diving (which is basically people trying to be flying squirrels) after trying base-jumping and shark-baiting so you can imagine how dangerous this is. Still, despite it's danger, there are teams in at least half a dozen countries trying to be the first to perfect the art of falling without a parachute. The original article can be found "here":http://www.nytimes.com/2007/12/10/sports/othersports/10flying.html?ex=1198040400&en=2246abb0d4805064&ei=5070&emc=eta1 at the New York Times website.