I've been spending a fair amount of time thinking about NUI or Natural User Interfaces. I've been an iPhone owner for almost 2 1/2 years, just picked up a Magic Mouse (though what I really want is a trackpad attached to my keyboard), etc. I'm getting really close to the point of building my own multi-touch table (thanks to the awesome guides at http://www.nuigroup.com) and am still excited about doing so. That said - take a look at this this:

http://www.ted.com/talks/pranav_mistry_the_thrilling_potential_of_sixthsense_technology.html

Not sure how I feel overall about a projector constantly illuminating the world around me, but it's a ridiculously cool concept. Now I just need one of these to look at resistor color codes and tell me what it is...