Regarding the PS3:
It has only 256 megs of RAM and so Linux doesn't run well on it. MacOSX and Windows aren't even available for it either.
I have a friend named Joel with a PS3 and he's sick of running Linux distros that are designed for lightweight hardware just because of the memory footprint. He'd like to see AROS or something small running on it so that the apps will run smoothly without constantly swapping to the hard drive.