Nintendo doesn't exactly advertise it, but the remotes for the Wii gaming console (including the balance board that comes with Wii Fit) have Bluetooth capabilities.
That means you can connect your Wii peripherals to your computer to operate the media center hooked up to your TV, play emulated games with a Nunchuk, Classic Controller, or even a Balance Board, and pretty much have them do anything you can do with a keyboard. Let's walk through linking up your Wii peripherals and putting them in control of your Mac, PC, or Linux box.
To give you an idea of what you can do with a Wii/PC hook-up, here's a look at one neat example: Controlling Windows Media Center from a distance, without having to shell out for a separate remote control.
Video is courtesy of Flickr can be seen HERE, and the software setup can been seen at the link up top of this news article.