Interesting idea from Nokia...

Or, "As easy as charging up your mobile phone"

Imagine (for whatever reason) you're going on a long bike ride, but your mobile phone is running low on charge. Evidently someone at Nokia thought that the power generated by a dynamo sandwiched between the frame and wheel could do more than illuminate darkness...

http://www.reghardware.com/2010/06/03/nokia_bicycle_charger_...