Nokia Labs have produced a application that reads sms messages in braille. No it doesn’t produce raised bumps on the screen but vibrates for each letter according to which of the 6 dots in the braille cell are raised. The buzz will be loud or soft according to the status of the dot. This in effect means that there are 6 different ‘buzzes’ for each letter.
Braille users are very enthusiastic about using braille but I wonder how difficult it will be to wait for 840 buzzes for a full 140 character text message. the application is free to download here. As I’m not a brailler, I’ll wait for feedback from those who are.