Love it or hate it, Microsoft Windows is the world's most dominant operating system. But when you look at some of the hot features found in competitors such as Linux and Mac OS X, both XP and Vista can seem a little incomplete.From intuitive interface features like Apple's application dock and Cover Flow to basic media capabilities such as ISO burning, Windows often falls short on built-in goodies. And some features that other operating systems offer by default-- such as 64-bit processing and business-networking tools--require a premium-version license in Windows.