I believe that the sound is caused by the camera's auto focus lens. My iPhone 3Gs also made the exact same noise when putting it down on a flat surface.
Yes, I have this "issue" too. I thought it was because I dropped my phone once (no damage though, caught with my foot so it didn't hit the floor very hard). I was actually going to take it into Verizon to see if it was broken, haha... Glad to see it's normal though
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