Jane recently bought one of these Power Monkey gadgets. Its a solar-powered charger that you can use to recharge or power various devices.
As well as charging via solar power, you can also recharge via USB or mains power.
It comes with a plethora of connectors to fit most mobile phones, PDAs, iPods and digital cameras.
Not super-cheap (AUD170), but very handy, especially if you need to recharge your phone and you’re away from mains power for some period.