A rumour is currently floating around about the Xbox controller getting a 47 key QWERTY keyboard attachment which attaches to the bottom of the controller. If it actually makes it to the shelves it will be used for email, and instant messaging capabilities. Rumours say that it should be available this summer, but no price is available yet.
When connected to the bottom of the controller the unit actually connects to the headphone jack which can pass the signals back and forth to the Xbox.
Via: Engadget