The PoP Video is an add-on accessory turning iPod Touches (3rd/4th generation) and iPhones (4/4S) into a pico projector, with no need for extra cables.
It connects to iDevices via 30-pin connector and beams images at qHD (960x540) resolution at 13-130cm projection range. Battery life is up to 2 hours, with micro-USB connection handling charging duties.
The unit is around 1.5cm thick and weighs less than 100g.
A free iOS app provides a number of functions-- including simple projection of videos or web browsing via Safari.
Go PoP Video