Nature reports that nanotechnology researchers at the Georgia Institute of Technology are working on a shirt that converts the wearer's motion into energy to electronic devices from iPods to wireless devices worn by soldiders on the battlefield. The National Science Foundation is funding the effort, which exploits something called the piezoelectric effect.

That might be a step up even from newfangled devices, such as a combo car/wall charger for iPods and iPhones.

Maybe the nanotechnology could even be used in pillows to improve existing iPod pillow-based products.