At the end of this article, there is a link to a YouTube video from the 2008 AUSA convention showing Sikorsky's vision of Army helicopters using Sikorsky's X2 configuration. What does anyone think of this concept, or Piasecki's Vectored Thrust Ducted Propeller (VTDP) technology being used to modify current helicopters?

And then there is this from Bell Helicopter (and this).