Everyone is concerned with privacy today and especially with computer privacy. There are screens for sale that you can put over your laptop screen so that people sitting beside you cannot see your screen.
My idea is similar to plugging in a special pair of glasses into an iPod or similar device and being able to watch a video, only for a computer.
A specially designed pair of video glasses that could be USB supported, could be attached to your laptop computer. Upon attaching them, the laptop screen goes blank and the video is then transferred to the glasses that you are wearing. You can still use your mouse normally, however, because you have on these special glasses, only you can see what's on the screen. This will provide complete and total privacy!