I found out about the CWiid project, which consists of a library called libwiimote, a wminput application to make your Wiimote into a mouse, keyboard,...
Short video of Linux booting on my Wii.
It's running Debian/Whiite 0.1a, kernel 2.6.27b-isobel-wii and xorg 7.1 (with nuvalo's cube driver), controlled by a wiimote (cwiid...