Same deal for the pearl. Aside from changing the profile to silent, or maybe a third party app, you can't turn it off. I never even thought of that either, until just now. I'm upset that I can't turn off my shutter sound.
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I never thought of it either until you brought it up. I could on my Treo. Although, the shutter sound saved me from taking more than 2 extreme close ups of my belt while driving my buddy's car the other day