Use your computer’s keyboard with your mobile phone

You’re sitting at your working desk and your desktop computer (or laptop).
Due to a reason or another you want to write some text on your mobile phone. But you don’t since all those keyboards suck.

Why not have your computer talk to your phone (for instance via bluetooth) and write your text on your big keyboard? This way one could do some real emailing and chatting on the phone.

An idea for monitor sharing is here.