I'm waiting for some manufacturer to create a Pocket PC device with
LCD (accelerometer) glasses that emulate a multi-32" LCD screens as you turn your head... and also when you look down, you see a virtual full size keyboard that you "tap" away at. ( rings on your fingers are accelerometers, bluetooth to the pocket PC ).
Ultralight weight, zero tray footprint.
Technology is mostly available today ( OK the ring accelerometers with blue tooth need a bit more miniturization) ... just needs to be made cheap and mass produced.
I bet such devices will be generally available within 10 years or so.