Cover Flow in Finder
Far and away the most polished file viewing mode in any operating system, images zoom large as they transition from side to center. Although a scroll bar appears in Finder's Cover Flow mode, the arrow keys can be used, and the images themselves can be clicked. In touch screen iPods and iPhones, images are scrolled only by touching.
When a multi-page document is selected in Cover Flow, left/right scroll arrows appear to allow the user to flip through the pages.
Learn more about Cover Flow