Love the idea. I have been kicking around a similar service but does it with a robotic hand (e.g. http://www.bondgifts.com/) to convert typed notes to hand written notes and mailed. Bond charges $5 and it comes in a nice presentation, but haven't found the "perfect" way to capture address of friends/people I am sending to other than just to ask. I think thats a need that might need to be tackled. Although if you got an email from a service saying "your friend XXXX" wants to send you something and asked for your address, not sure people would give it.