This Uniden pico projector costs a grand. It projects images up to 100 inches diagonal, weighs just 122 grams and can project for almost two hours. Oh, and it has lasers, which is probably why it costs more than some 40-inch TVs.
The laser technology apparently allows the projector to always project a focussed image, even on curved surfaces. It comes with a VGA adapter that will connect to your PC for those exciting powerpoint presentation everybody loves so much. But considering the device only projects at WVGA (848x480 resolution), it just seems pricey – surely having to manually focus isn't worth that much money?