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I am pretty sure the iphone has always allowed charging via 5V. They just removed support for 12V charging when they removed firewire support. You should be fine with any device that works for the 3Gs.
 
Ya, I'm guessing that if everyones docks were to suddenly go useless then we would find out pretty quick

I'm getting to excited about being able to use Pandora in the car :eek::p:eek:
 
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