This is wonderful technology.
Imagine this with a the digitizing technology in the laser keyboards(
http://www.virtual-laser-keyboard.com/). This will allow your phone or PDA to have a full sized desktop instead of a 3" screen.
Take a look at the link to the virtual keyboard and then imagine replacing the projected keyboard with an image like a lined piece of paper or your PC's desktop. Use your finger like a mouse to navigate the desktop or write in your own handwriting on a virtual piece of paper with sketches, etc. The data is digitized in the little projector/computer. If the projector is also your phone (or can connect to it) you can then email the note right away. Hey if you had a digital camera in the thing you could take a picture of a something you needed to change, mark it up on the virtul desktop and email it or print it (in black and white) via the nearest fax machine thru the phone.
Don't say that you might as well just have a laptop, instead imagine if your laptop fit in your shirt pocket!!!.
They always said I think outside of the box.