YoGen yo-yo gadget charger

LAS VEGAS--You can now use muscle power to charge your electronics. Easy Energy at CES 2010 showed off the YoGen hand charger, which is now available for $40. When you pull the string, it turns a mini flywheel that produces a steady stream of power--up to five watts--for small, portable devices. One minute of pulling is enough to charge a cell phone, according to the company. Easy Energy is adapting the same flywheel alternator technology for a pedal-powered laptop, called the YoGen MaxT, which is still under development.