For those of us that travel frequently, it's mostly a chore to lug around a laptop. Treos and Blackberries are fine for sending a short, urgent message, but many of us has real work to do in the morning or in the evening while on the road. For that you need a full size keyboard and display.
This new projector technology (in this example, built into a cellphone) would let us ditch the laptop. As long as we had a small, portable computing device like a Treo, this new display system would work very well with a small, portable keyboard (which would be much easier to lug around than a laptop).
Eventually, these small display systems may get rid of desktop LCD panels and CRTs as well. A tiny cube will sit on the desk and display onto a piece of stiff paper, a special reflective screen (like a miniature projector screen), or even onto the wall/cubicle. And add in the new projection keyboards, and our portable computing devices become the desktop--nothing else is needed.