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I've looked into solar chargers, for batteries & iPod.  For me it's easier to bring spare batteries.  A couple extra sets of batteries weighs a whole lot less than the reliable rigs I've seen.  That leaves the iPod as the only reason for me to spend $200 and add pounds to my pack.

Solio, you will likely come across this product.  I have heard nothing good about it except on the Solio website.  Unreliable fashion-gear.

I have heard of a woodgas stove that can recharge, but I can't find it.  Basically it has a heat exchange that drives a generator which powers the fan and has output jacks.