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We’ve been testing these new Zunes and find them to be notably better than last year’s entry. They are smaller, lighter and more attractive, and they include three big improvements. First is a new controller, called a Zune Pad, that combines buttons with a touch pad for scrolling. Second is a completely overhauled, simpler PC-software program and online store, the Zune Marketplace. Third is expanded usability of the built-in Wi-Fi, which allows you to synchronize your Zune and your PC without plugging in a cable and makes sharing songs between Zunes — its only function last year — slightly better.