This is so thinking-outside-the-box! I'm amazed with that technology. Thanks for sharing it here. If this takes of (it probably should, but I don't know if it will), imagine people in a few years being able to write and read directly with the kind of the symbols that appear at 4:45 in the "Idea"[1] video!
[1] http://www.8pen.com/watch?v=1