I heard about this very canny device yesterday - a Nokia phone charger that runs on pedalling. Running out of battery when you're out and about can be pretty inconvenient; but if, like increasing numbers of Londoners, you're out and about on a bike, you can now charge as you go. Charging starts when you cycle at walking speed (6 km/h) or faster, and at 12 km/h it charges as efficiently as common Nokia mains chargers. That's what I call pedal power.