Last winter, while snowboarding down some snow-covered mountains, I periodically had a thought:  Wouldn't it be cool if there was a way to use the speed you gain while traveling downhill to create lift and fly?  A couple of crazy Frenchmen (I think) have done exactly that by successfully inventing the sport of speedflying, a combination of skiing and parachuting.  These two videos show it being done.  Where do I sign up?  (via kottke) #sports