In a post on Ars Technica, Cyrus Fariver explains how he made a solar charger for his iPhone for about $100 and 3 hours of time:
Until last week, I was one of those people who admired the craftsmanship involved in many DIY projects, but thought that they were a bit too involved for me. I’ve always felt that wordsmithing—rather than electrosmithing—is my best skill. I mean, sure, I’ve swapped some RAM on my own computer before, but nothing that involved a heat gun and melting metal! But you really don’t need any background to start. It only takes an idea.
Simply from the DIY perspective, this is pretty cool, and might be worth trying out if you’ve got some extra cash and time.