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@30miles
Dynamo hubs can be expensive, agreed, but there's essentially no drag with the good ones these days. (This CTC article (pdf) offers a useful guide.) I'm currently touring with a Schmidt Son 28, and it's been terrific. Paired with a PedalPower+ Super-i-Cable, it charges everything we're carrying (iPod, mobile, e-reader, GPS, camera) except our tablet, which needs more power than the dynamo can provide. Portable battery packs should be able to charge a tablet, but they wouldn't be able to charge much (if anything) else once they've done so.