Four experts defend their chosen operating systems in an opinionated free-for-all OS SmackdownLinux Light on its feet and ready to strut its stuff Mac OS X All you need in one dynamite packageWindows Vista The best there is (despite the bad rep)Windows XP Hands down, the choice of the people Since the dawn of time -- or, at least, the dawn of personal computers -- the holy wars over desktop operating systems have raged, with each faction proclaiming the unrivaled superiority of its chosen OS and the vile loathsomeness of all others. No matter how fierce the language or convincing...