
Some of you out there will understand why you should be excited to hear that some brilliant soulhas devised a port of ScummVM for the Wii and GameCube, but in case you don't, lemme tell you: Monkey Island! Ok, ok, let me back up a bit. Scumm (Script Creation Utility for Maniac Mansion) is the language that runs classic LucasArts adventure games like Maniac Mansion (a-duh), Day of the Tentacle, and the aforementioned Secret of Monkey Island.
Here are the instructions for how to get ScummVM on your GameCube:
Theoretically, the same thing would work plugging it into the GameCube memory card slots in a Wii, but not having tested it, I can't say for absolutely certain.
ScummVM for the Nintendo Wii/GameCube [Wii News]