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Exactly, I'm thinking of Schmidt at the very least: http://www.peterwhitecycles.com/schmidt.asp

Those are insanely good hubs and output a nice consistent amount of power. If the chargers were compatible with these hubs it would be extremely easy to use them on a wide range of bikes immediately.

They already have them:

http://www.peterwhitecycles.com/ewerk.asp

Indeed. I suspect the existing base of dynamo-using cyclists would scoop this up if it was compatible.

An usb connector would be also nice.