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The Windows 8 Customer Preview includes a new program switcher that appears along the left side of the screen, you can use the mouse to access it (aim at either corner on the left side, then move the mouse toward the center of the screen.
It's easier, though, to use the Windows key + Tab shortcut. Note that the new program switcher treats the desktop as if it were a single app. It does not show individual desktop programs. The next screen shows you the alternative.