Sun Microsystems had a demo of this back in 1998/99. It's cool but it's not innovative.

One of the problems Sun Microsystems discovered with it is that peoples arms and shoulders get very sore and tired. I hope Microsoft have solved the human ergonomics issues.

in addition the technology is already being used in commercial, as opposed to demo, applications here and here

Naturally, this implementation of the technology being Microsoft's, the viruses will be included for free, getting rid of them will, however, cost, as usual.