Tiny projectors are starting to swamp the market. PicoProjector-info found yet another one of these compact projectors with the Syba RCG RC-VIS62002 pocket projector.
The Syba RCG RC-VIS62002 supports native VGA resolution but the description talks also about supporting 1024x728px resolution. This could mean that you can connect with XGA, and the RCG projector does some interpolating stuff to display it. The maximum image size is 40 inches, but the company only recommends 25 inches. The brightness delivered by the Syba RCG projector is 10 lumen. You can power the small projector with AC or a portable battery bank (DC 5V/2.5A).

The Measurements of the Syba RCG RC-VIS62002 are 3.75 x 3.125 x 1.75 inches. The RCG Pocket Projector is available for pre-order on Amazon.com for $399.