Nokia is testing fuel cell powered bluetooth headsets since june.
The 66-mwatt fuel cells are using fluid methanol. With one filling the can can operate for 10 hours. Nokia modified the available Nokia HS-3W headset to use a fuel cell.
Nokia gives no target date for a market entry of this fuel cell device. More details on Initiative-Brennstoffzelle (German).
More Fuel Cell Stories:
Honda Fuel Cell Scooter
Flies eating Fuel Cell powered Robot - EcoRobot II
Water powered Fuel Cell Toy Car by Daido Metal