Portable movie theater
This would be similar to a handheld media player/video ipod- except that it would have a built-in projector that you could use to project the image onto any wall. It would need to be super high-tech to be able to fit the projector lens and a high powerful speaker system into a handheld device. For business people, It could also have a keychain remote control and have the ability to read and display powerpoint files.
Reward: A free unit for myself.