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The full aluminum back/bottom of the keyboard serves to protect your iPad 2 display.
As you can see I have a GelaSkin on the back of my iPad 2 and the case is still held securely in place. There is some fraying around the edges of my skin, but I cut it back a bit to fit better into the keyboard case.
Most people will use the Logitech Keyboard Case in landscape orientation, as shown here.