GC-Linux.org have announced they have Linux running natively on the Wii using the Twilight Hack. They have even released a mini-distro/proof-of-concept.
QUOTE said:24 Feb 2008: Long time, no see Although we haven't posted any news in the last 2 years, we have silently continued our work keeping the kernel patches up to date. With the latest 2.6.24 release we have added support for the USB Gecko adapter as a console and terminal, so you can now logon into your gc-linux distro using minicom or HyperTerminal. And last but not least, we have finally run natively Linux on the Nintendo Wii through Team Tweezers' twilight-hack. We have released a small usbgecko-enabled Proof of Concept mini-distro to prove it. Did I say have fun?