Kinect has been on the market for nearly 2 years, and Leap[1] is the real thing for computers. The article sounds a bit awkward since it doesn't even mention them. Flutter has the advantage of not requiring extra hardware, but as a technology it is way more primitive and brittle.
Fair point about the Kinect. I was gearing this article towards tasks typically done on a computer. Granted the Windows Kinect SDK will allow for similar functionality once developers get on board. It should be interesting to compare the two. In comparing Flutter to the Kinect on XBOX, I've found Flutter to be more accurate, but of course it's more limited.
[1] http://leapmotion.com/