Veho's Mimi Wireless Gamepad Keyboard
"The Veho Mimi Wireless Gamepad Keyboard is not only a small form factor keyboard but also has a built in gyroscope so it can be picked up and used as a 3D mouse! Heck, if all that is not impressive enough, it also has a built-in 8-way gamepad with dual thumbsticks. Yes, this amazing piece of engineering will not only let you surf the web, and the mundane tasks but actually allow you to turn your HTPC into a full on gaming rig!"
I'm not entirely convinced of the utility of a keyboard that small, but if you're looking to ditch a full-sized keyboard on your home-theatre PC and still be able to do all the same functions, this looks like a possible solution.