Apparently, 95% of energy wasted by mobile phones is because of chargers left on when the phone is at full power. Given that the phone can detect when it is at full charge, it shouldn't be too difficult for some enterprising electronic engineer to design a system that shuts off the charger when the phone reaches full power. It would have to be a physical switch-off, though, not just going into standby and still wasting power. That would mean an extra button on the charger that you need to remember to push in when you want to charge and that pops out when it's done. It will take some getting used to, but so did mobile phones, right?
Mokalus of Borg
PS - This should be especially easy if the phone charges via a mini-USB connector.
PPS - Because cords like that are already designed to carry data signals.
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