There are a variety of games out there for USB charging that involve hooking resistors between pins on the charger. Motorola/Blackberry use this trick to indicate how much power the charger can provide, regular USB will only source .5 amp but Motorola/Blackberry have super chargers that source 1.5 amps.
I don't know if the Sony Reader can take advantage of those super USB chargers.
The USB charging Blackberry's require the Blackberry Desktop software to be installed for them to charge. On the Mac they won't charge until you install the Pocket Mac software...
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