Brunton SolarRolls are waterproof flexible solar panels that are available in a variety of sizes and can power or charge up electronic devices both large and small. The smallest is the SolarRoll 4.5 ($169), a 12" x 22" panel when it's open, which weighs 6.4 ounces and can output 4.5 watts, 15.4 Volts/300mA. That's enough to charge small electronics such as cellphones and PDAs.
But if you need lots more power, choose the SolarRoll 14 ($399) which is a 12"x57" solar panel when unrolled, and outputs—you guessed it—14 watts and 15.4 volts/900 mA. That's enough to charge up your laptop or DV camcorder. If that's not enough power, you can daisy chain these together for even more output. Included is a storage case so you can carry your power with you on the road or trail.