Well I guess I should dissect this piece by piece....
First of all, that first video was the worst technically but was still my favorite because it linked me to this
VIDEO (NSFW)The second video looked much better and less responsive to everyday hand gestures, yet more responsive to deliberate hand gestures. I guess what I'm saying is, there's less of a middle ground....which is good.
That third video, while interesting, could never work that like. How in the hell did he pick the channel he wanted just by pushing forward?
Either way, even though I'm skeptical, I think there really is potential for this kind of technology, although I don't think we'll see something revolutionary till a few years down the line. For instance, I would love to control my computer or iphone device without smudging the screen.