The new nPower PEG (personal energy generator) by Tremont Electric wowed reviewers at the 2011 CES convention. This back-up hybrid charger allows you to keep your cell phone, iPod, or other hand-held device working while you’re on the go. By harnessing the kinetic energy that you produce through movement, then converting it into accessible power, the nPower PEG allows you to be the manufacturer of your own renewable energy. The nPower PEG is marketed for those with an active lifestyle: commuters, cyclists, college students, backpackers, emergency responders, and exercise enthusiasts.
http://www.metaefficient.com/rechargeable-batteries/npower-peg-recharges-using-kinetic-energy.html