If you're looking for a good case without any bulk at all, I have a clear one that just covers the back of the phone. It's called the air jacket set, comes with a screen protector but I don't use it because of the new coating on the screen. My sister goes without (she has a white 3G) and I don't know if its her dropping it or what not but it's pretty banged up.
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White 32G 3GS, 15" MacBook Pro
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