Very interesting idea. I think it must be possible. You can already transfer files through opp. So we would need a piece of software on both devices. One on the n900 to paste something into and have it sent as a text file. and one on the other side to take this textfile and instead of saving it put it into the paste buffer. Same for the other direction. So i think basically all pieces are there and shouldn't be a problem for a progammer familiar with bluetooth.