A number of bloggers have questioned if a single charger for cellphones is a good idea. The industry settling on a common connector would simplify life for consumers. But Kit Eaton at Fast Company points out the Micro USB standard has its limits. It isn't as fast and flexible as the iPod connector, which may explain why Apple didn't join the pledge, he says:
...smartphone makers may well end up incorporating both a micro USB adaptor, and a proprietary one for specialist data transfers to their devices. That'll require at least an extra lead or two in the box, losing some of the environmental benefit, and placing a constraint on product designs.
Sigh. It's never easy.