In reply to Denni:
Just be careful about these small Picopix projectors, you need to do a lot of research on the reviews about them. Very few of the cheaper ones will run powerpoint etc direct from your computer, yes they can display whats on your computer screen, but at the same resolution, when its blown up to fit on the wall it looks crap. Standard projectors access the program direct and display it at a much higher resolution on the wall than on your PC screen. Also the brightness can be great in the dark, but just shutting the blinds in a room on a light day they ain't going to cut it. Mind you LED lights are the way to go, lots of Youtube reviews out there.