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You don't need a case. Just wear one of these whenever handling iPhone 4:

bomb-disposal-suit-bd2009.jpg
 
I have to admit the glass makes me hesitate to get an iPhone 4 (plus I'm waiting for the white version). I really like the design, but would prefer if the screen border and back were made of anodized aluminum like the iPod classic and nano. Those things are practically unbreakable yet still beautiful. Maybe next revision.
 
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