WiiToo is a minimal precompiled stage4 made to let you run Gentoo ~ppc on your Wii using MIKE and mini. It provides all the basic software required to compile and install new programs on it, and some other software ready to be used. The kernel used is plain vanilla-sources + wii-linux patches, so expect Wifi working out of the box.

Features:

ready to use, uncompress, copy, configure and boot it!
highly configurable, like Gentoo
usb keyboard isn’t a requirement, simply configure your network and use ssh
can use all the hardware that wii-linux is able to use

http://www.wiibrew.org/wiki/WiiToo