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skinny-
how do you charge garmin/phone/iPod?
From a battery, e.g. ten Nokia DC-19s cost about the same as a SON dyno hub and weigh about twice as much, but don't suck up your power. Between them, they hold about as much energy as the dyno can generate in 36 hours of riding. Sure, if you're going to do more than about 48h of riding between access to mains power for recharging, a dyno makes sense, but then you're probably talking about Iditabike, and electricity is the least of your supply worries.
gbj_tester
A dynamo hub with an aero rim, I guess I'd like to see that. I somehow feel that if you need a light, you don't need an aero rim... unless you plan to do some crazy US Coast to coast race where you do 25 mph on an interstate in the middle of the night, in which case I would ditch the horrible drag of a dynamo hub for a set of batteries... any other scenario seem to exclude one or the other