We know that Natal is sensitive, but you might not have realised exactly how sensitive it is.
There's been a lot of talk about Natal, but it's only now that we're getting to see people actually using it, and its sensitivity is actually quite impressive. In the video, it's able to keep up with the guy dancing, in pretty low light. It's even able to follow him when he goes down on one hand, although it would appear that it does cause the software a little trouble figuring out exactly what he's done.
It's quite exciting though, to see how capable the hardware actually is, and while I wouldn't necessarily want to play an action game with it, something that features investigation like Silent Hill, or the forensics elements from the Condemned games, or a properly made Natal RPGs could be amazing.