A clever Chinese man named Johnny Lee showed the world how to make TouchWall . Without thinking, we did the same miracle.
To do this, take the wireless controller from the game console Nintendo Wii, video projector, PC, bluetooth adapter and make a simple infrared pen. ')
The board is used in our workflow for presentations, workshops, brainstorming. In the video, we just indulge with the board. In this case, Adobe Flash was used as a drawing application.
On the website of Johnny Lee you can find instructions on how to make a magic board, as well as other interesting magic stuff with the Wii Remote, monitor and computer.
UPD : By the way, you can use not a projector, but a large plasma TV - with exactly the same success, and even a drawing person will not cast a shadow on the image.