Walking around Macworld 2012, I spotted a guy projecting a video onto a wall from his iPhone. I haven’t yet seen one of these worthy of mentioning but Dan and his pico projector from Brookstone had me stopped in my tracks. The case is a battery charger/pocket projector. You simply dock your iPhone 4 or 4S and project on any surface. This Pocket Projector for iPhone 4 is perfect for on-the-go travel info-tainment. Brookstone says, “Its super-bright 15-lumen LED projector lamp ensures clearer, more brilliant images than other pico projectors. 640×360 native display resolution projects up to 50″ images. Focus adjustment lets you control image clarity while the integrated 0.5W speaker delivers the audio.”

A total bonus is that this projector is rechargeable and it powers your iPhone!
The Pocket Projector’s built-in 2100mAh battery charges via USB connection with the included cord. When fully charged, the projector can also serve as a back-up battery for your iPhone 4 device.

If the $200+ price point is slightly on the steep end for your budget, here are some tiny alternatives from Amazon.

Not for the iPhone but this projector is pocket sized:

AAXA P1 Jr Ultra Portable Pico Pocket Projector, LED, Media Player, Speaker, iPhone Compatible

NEW! PP003 Portable POCKET PROJECTOR