a chip inside my brain that lets me see the stuff in 3D, and I can switch between the real world and the computer world at will, or can see them at the same time, and moving in the computer world can be independant from the real world if I choose.
and it uses an OS far more advanced than Longhorn, gives me internet access which is so fast the servers I connect to slow me down, and it is a complete database of everything ever learned by the human race, and I can run any game from any platform in real-time (screw frames per second)