Possible Duplicate:
How do I disable the 'click' sound on the camera app?
I'm not sure if this question is specific to Lenovo ThinkPads or if it is more general to Android 3.1 devices (I haven't upgraded to ICS yet since I don't want to risk losing root right now).
But basically, even when I turn the volume all the way down to 0, my ThinkPad still always makes a sound whenever I take a picture with it.