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Twelve South PlugBug
I love my gadgets, but more gadgets means more chargers, which in turn means having to have more wall outlets.
The Twelve South PlugBug solves this problem by combining the MacBook Pro charger with a 2.1A USB charger. The output of the USB charger is powerful enough to charge an iPad, which means having to carry one less wall wart.
Image source: Twelve South.