I've been reading a lot of posts where people are saying that they will buy an iMac and drop in the Merom processor when it comes out. Will that void the warranty? And if I did decide to change the processor, how exactly would I go about doing that, take it to an Apple store or something? I'm just confused because I thought the only thing upgradeable on the iMac was the memory, since it is a closed case. Anybody know anything about changing the processor? Thanks in advance for the replies. Oh, and any idea how much it would be to upgrade, if possible?