Horizon's Hydrocar, the follow up to their H-Racer fuel cell toy, uses a next generation polymer electrolyte membrace based fuel cell. The tech is characterized by operating at lower temperature and lower pressure, making it a safer tech if it were to be used in full sized cars. That's good, because this little model only turns after it bumps into things. It ships next month for $79.
Check out the Minority Report design and the twin oxygen and hydrogen tanks that fill as the water tank is electrolyzed into gas.