only way to hack gamecub is with by using phantasy star online game and its interface to hack in via network cable.. perhaps a guide to come soon.. ;-)
i thought he was lying but still somebody might like gamecube and xbox and mad a program for hacking gamecube
still might be possible... i could see using the xbox to ftp into the gamecube... but you do need that game (i think thats the right game) for the game cube to get it to work... check it. http://www.maxconsole.com/?mode=content&content=tutorials&feed=gc&itemid=119 gamecube hacking (but via a pc.. )