This bad boy will seamlessly fit onto your Xbox 360 controller, includes the wired headset and cost you $30 before tax and shipping. I am guessing that it will throw off your game since you won’t be able to wrap your fingers around the controller (it will block the inner portion), especially for those with big mits. But what’s ‘play control’ when you have IMing at your thumb tips….

More info here (its officially called the Xbox 360 Messenger Kit).

Features:

• Chat on Xbox LIVE with ease featuring dedicated keys to letters and characters.
• Don’t hamper your style—the Xbox 360 Chatpad attaches seamlessly to your Xbox 360 Controller.
• Backlit buttons allow you to accurately type words even in dimly lit environments.
• Messenger Kit includes the Xbox 360 Wired Headset for the ultimate communication bundle.