It's a pretty good exploit, but I don't have Zelda twilight princess.
http://wiibrew.org/index.php?title=Twilight_HackUsing a stack buffer overflow (which uses a lengthy character name in the game) it triggers a boot.elf which will load all your homebrew goodiness!
It also requires an SD card reader for the computer but I don't have one yet.
I'll let you know my results once I get everything I need.