I have a unibody Mac Mini that gets quite hot when I play games (using W7 in Boot Camp). I once placed a plastic box full of ice on top of the aluminum enclosure to help it cool off while I played, and it really helped. The whole thing was icy cold for a long time. I haven't done it again, because I thought that maybe condensation inside the machine might become an issue. Am I right to be concerned, or do I have nothing to be worried about? For the record, I couldn't detect any moisture on the outside of the plastic box nor the aluminum enclosure. I'd love to be able to keep my machine icy while I'm running heavy-duty stuff on it. It does get quite slow when it really heats up. Please give me your thoughts. Thanks.