I took the intercooler off mine. I had heard horror stories about it melting into the back of the 360. I took it off to clean it one day and just never put it back on. I don't think it really helps all that much.
But on another note, I got a DDE when I was playing Madden earlier today. And I got all these marks on the back of the disc. Oh well, this doesn't happen that much so no big deal.