We recently found that a few models of micro projector have began including direct VGA inputs for use with computers. The M1+ from Aaxa Technologies is one of the most powerful micro projectors on the market and has this VGA input. We call it a "micro" projector because it isn't quite a "pico." It's not small enough to fit in your pocket but is still very small and portable. It fits easily in a briefcase or small bag and weighs about as much as a can of soda.
For a full list of features check out the M1+ Micro Projector