GREAT Hack of RevoltLab.com!
It consists of an array of solar panels mounted on a sturdy military surplus case, a 5 volt regulator, some capacitors, a switch, and a USB hub. The great thing about USB-charged devices and most cell phones is that they all take 5 volts! With this simple project, you can make yourself an emergency charger for phones, mp3 players, digital cameras, and other tools crucial to the revolution. Best of all, the simplicity of the design means beginners can understand how it works and learn to make their own!