I am of the mindset that if you buy an ultra slim and beautiful gadget, you should enjoy its beauty and do not uglify it with a case. However, if you own a Macbook Air and MUST protect it, the MacBook Air Shield by Agent 18 is a good compromise that maintains as much of the air's beauty as possible.
The $50 case comes in white, black, or pink and is made durable polycarbonate that fits around the edges of the lid and covers most of the bottom of the notebook.
The MacBook Air Shield features an opening for the notebook's vents to prevent overheating and allows you to easily plug stuff into the ports on the side of your MacBook Air. Which is great, since the air only has ONE USB port...
MacBook Air Cases
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