Though it likely won’t hold the title for long, Earth Trek has christened their new 90-805R projector the “world’s smallest”. It measures roughly 4 inches X 2 inches.
The device will give you a 22-inch diagonal image, though I have no idea from what distance. It sports an SD card slot and a 3.5 mm jack A/V input, built-in lithium battery good for 1-2 hours, MP4 player and built-in speaker. Nothing on price or a date yet, but expect it very soon. Not much else to see here, move along.