Hi, Am going to be switching to the new MB Pro. Upgraded my current IBM with a Seagate Momentus 7,200 hard drive, and I'd like to do the same with the MB Pro. With an IBM you get the XP discs for free, so I could just reinstall Windows. But am wondering how I can reinstall the Mac OS if it comes preloaded. Or does the MB Pro come with Tiger on discs? Thanks. Nobob.