Seems like a silly question, but rumours are the new iPads will be waterproof so why not iMacs? keyboards at the very least need to be waterproof as standard. iMacs don't necessarily need waterproofing, but dust and waterproofing go hand in hand. And anyone who has ever opened up an iMac for repair sees how much dust collects in the interior. Besides, waterproofing the mac could be rebranded as 'drunk proof'.