Just a quick question. I have Tiger software that I want to sell on eBay but I'm not sure whether it's been registered or not yet. Does anyone know where to go on Apple's website to determine whether a copy of Tiger has been registered yet? Can you punch in a serial number or something? I can't sell it until I know. Also, what difference does it make if it's registered? What's the downside of that for someone who buys it?