Here are the keyboard shortcuts to use with Flip 3D.
Windows Logo Key+Tab: Keep the Windows key pressed down and repeatedly hit on the Tab key to be able to flip through the windows. You can also use the arrow key to move back and forth through the open windows, along with the mouse scroll wheel.
Windows Logo Key+CTRL+Tab: After pressing all three keys at the same time, you can take your fingers off the Windows logo and Ctrl keys, and hit on tab only, to scroll the windows. Hit enter to select one.
Alt+Tab: This will arrange your windows, horizontally in the following fashion. This feature exists in earlier versions of Windows as well.