According to this news SMK Corp has shown a pen that can transmit characters written in the air.
The pen has a built-in triaxial acceleration sensor and the Bluetooth function. The sensor detects the positional information and recognizes the inputted characters. The characters are wirelessly transmitted to a monitor via Bluetooth. The maximum transmission distance is reportedly about 10m. It is expected that the pen will be used in place of a laser pointer in sales presentations.
It seems to me that using this pen any notebook could become a Tablet PC!