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Sony Ericsson already has one of these on the market, but Nokia has a new Bluetooth digital pen coming out that can transmit what you're writing directly to a cellphone and either store it as a file or send it off as a multimedia message. You do have to write everything on this special paper, but the SU-1B Digital Pen (which, we're guessing is based on the same technology used in Anoto's Bluetooth digital pen) looks like it'd be really helpful for writing out messages quickly rather than tapping them out on a cellphone keypad or for sketching out ideas.
Read [Thanks, Mike and Jon]