I remember a company in Florida called Consulier http://www.consulier.com/ had done something with fuel cells and I still have a magazine article on it. They were even talking about racing with a fuel cell car after they won one of the endurance races at the time with the Mosler Raptor. They now make the Mosler http://www.moslerauto.com/test/index.html which are just fantastic looking cars.
Slightly off topic, but I know hydrogen fuel cells (for automotive applications) car run around 350 amps at almost 200 volts, that is "short term" levels... aka can hold it there for 10 minutes without damage, but the fuel cell gets pretty hot if held there much longer. At "continuous" levels, the ones I saw were stable around 250V and 250A. The only issues currently are reliability and cost (uses lots of platinum) as well as storing enough hydrogen onboard (safely) to go more then 200 miles.