Because I work at a University, I sometimes get the chance to choose to either have a white or black board in my office. As a regular watcher of the American TV show numb3rs, I really want a transparant board, but I can't think of a good scientific reason
for having a transparent board, so I will never get one.
Of course the real reason I want a transparent board is so that I could clean it. I would then ask visiting scientists to come into my office. They wouldn't see the board and walk straight into it and break their nose. I would then take a picture of them bleeding and then post it my victims blog. Perhaps then I would get some coverage in Physics World.