We've always felt that Pico projectors are a little uninspiring, but the Pop Video iPhone projector from Micron Technology displays higher-resolution than the rest, and is small and cheap enough to be practical

The 100g projector connects to your iPhone via a retractable 30-pin dock connector and displays video at the iPhone's full 960 x 540 resolution (similar projectors are usually trimmed to 640 x 360). The corresponding Pop Video app allows you to tweak the image. On a full charge, the little guy will run for two hours, which is roughly long enough to get you through a feature-length film. Obviously, it requires a pretty dark space to produce a decent picture, but for that £65-odd price, it's a nifty little accesory. The Pop Video projector is available for pre-order in the US now and hopefully in the UK soon. [Micron Technology via CNET]