Sony announced the Wireless Keypad for the PS3 in August. The official Playstation blog features a video that demonstrates the keypad and touts the keyboard as the must have accessory for Playstation Home.

The full QWERTY keyboard is operated with the thumbs. The keypad is paired to the PS3 by connecting it with the included USB cable.
The keypad supports chat and has quick access buttons that can take gamers to the friends list and Message Box during gameplay. Another interesting feature is that you can use the keypad with other Bluetooth enabled devices like Smartphone if they support keyboards.
The Wireless Keypad for PS3 sells for $49.99 on Amazon.com and ships December 15th.