Ah yes... the visual barrier...
Fug the projection screen, I hope they come out with one of those dealies, in the movie the Matrix, where they plug your bellybutton into a huge computer.
We can't be far away from simulating touch and feel (to our nerves), I read about a scientist who was experimenting with this sort of thing for artificial limbs.
Man... the next 20 years or so are gonna be uber-cool!
-SW