A port of the Linux operating system kernel and assorted GNU userspace to the GameCube and Wii gaming consoles from Nintendo. Please, see http://www.gc-linux.org for additional information.
This is great. When I press power on my Wii, it boots right into whiite, and I can run it headless through ssh. All packages are outdated though, so you need to update the sources.list file located in /etc/apt. With a quick google search for "Debian lenny updates", you can find the updated urls for your sources file.
Took a bit of time to install, but once it's on it worked well. Be aware that it can't tell the difference between primary and secondary RAM, that it's no longer supported, that it's an old Debian and sometimes WiFi breaks so you need to reboot. But those are only small niggles when you consider what you get - Linux on the Wii :-)