Here’s a set of simple instructions for building a portable device recharger using the awesome PowerFlim, flexible solar panels. You can build the project for around US$30 and it involves little more than the panel (@ 6v. 100mA), a 5V voltage regulator, and a USB connector. He calls it an iPod charger, but it could obviously be used with other similar devices. I like how he lists “Exceptionally Good Coffee” as one of the Bill of Materials. Personally, I’ve found that electronics work and coffee don’t mix very well (i.e. jittery hands wielding a soldering iron), but YMMV.