TR-those all look interesting. The Minty Booster looks like a homemade version. The kit is about $20, so economy of scale obviously makes a difference. If the Ipod one had a USB port instead of the Apple connector, it would be almost perfect.

There probably is one out there for about the same price. Just a matter of looking, I suppose.

I saw some solar chargers online as well for about $20 or so. Some of them charge AA's, so for a long trip, a charger, plus a AA to USB adapter/charger would run a small MP3 player for a long time.

My little player is a Sansa Clip-only 2G, but it also has a radio, which I wanted, so for me, that is enough. It will hold about 500 songs, which to me seems like a lot. More than I would be listening to on one trip, even if it was a week or so.