Solar power probably won't save my batteries in the cloud-covered skies of Seattle, but you just never know when a little solar juice may come in handy. I've got two iSun units, which, linked together, offer enough solar power to recharge an iPod or individually power a cell phone. These little solar cells ship with numerous adapters to accommodate virtually any powered product and supply approximately 2 watts of power via the solar cells. This is a useful tool to take backpacking in case of emergency or when you happen to be away from electrical outlets for an extended period of time. Link enough of them together and you could probably light a room.