Personally I don't stack consoles. I don't like the way it looks. Also I don't want to chance the tower of consoles falling over. I don't know if its bad for the systems, but I would imagine all of them stacked on top of each other, especially if all plugged in, could be a safety hazard. Also the GC while not in the weight class of the xbox, is still heavier than the Wii, I personally wouldn't stack it on top. Just as an example, my daughter put a plastic container of crayons and markers weighing about the same as a 360 on top of her dvd player in her room. After about a week when she tried playing DVD's it made a horrible noise and when it would play it would sound like it was rubbing on something. Over time the weight pushed down on the part that spins the dvd and when it spun it would rub against the top portion. Not saying this would happen with the Wii/Gamecube, but better safe than sorry.