Pico projectors are the ideal way to unleash the video on your PMP or iPod. Just plug it in, make sure you're in a dark room and you can be watching those once shackled videos with a 50in picture. Not quite SIM2 quality, but great if you've got something to show a group of mates.
While the LG HS102 and Acer K10 might call themselves pico projectors, they're not nearly as slimline as their rivals. The RXS Redshift PPR4803 comes in at just 115x50x23mm, its rival the 3M MPro11 measuring the exact same size. That means that if you love baggy jeans, they'll fit snug in your pocket.
You don't always need an external source
The Aiptek V10 comes packing 1GB of internal memory, plus SD support, meaning you can fling footage wherever you are without having to slap in a PMP or laptop. That means you can start having those impromptu screenings without the need to lug around extra gear.
They're for TV, not movies
While Optoma's dinky PK 101 has a battery life of around two hours, pico projectors are not designed for watching 50s Biblical epics. Think short, arty movies, low–rent music videos and a couple of episodes of Curb Your Enthusiasm and you're on the right track.
They're not the brightest in the box
Light is definitely an issue with pico projectors. If you're not in a virtually pitch black room, then getting a crisp image can be a real pain. The Aiptek V10 is where it's at if you're after a decent effort, seeing as it doesn't need to be as dark as your local Odeon to get a crisp and bright picture.