After waiting a month I was happy to receive my iMac a few days ago! I have been browsing the forums for potential problems with the new iMacs, but luckily I think mine has passed all of the lemon tests. I was wondering about reinstalliing my OS. It seems some people like to reinstall thier OS on receipt of their new mac. Is there a reason for this? Is there a bunch of useless stuff preinstalled or something of that nature? Thanks for the help ahead of time, I am a former PC user and need a little help in getting up to speed on Apple's standard practices.