On the Today show this morning, Bill Gates despite his boring personality gave a short but impressive demo of Microsoft Surface. It's like a tabletop with sophisticated touch-screen technology. Here's another demonstration. It's so awesome that it's hard to accept that Microsoft developed it!
You can, like, put your credit card on the tabletop and pay even the waitperson's tip that way. It's still years away from being commercially available and affordable for us mere mortals, but a few businesses like hotels (Starwood), those with kiosks like cellphone vendors (T-Mobile), and Harrah’s Entertainment will be featuring it soon.