From my (admittedly limited) understanding, Homealone is right in stating a few of the issues yet to be overcome. But I have been looking into it, and it appears that quite a few of the main manufacturers are investing shedloads into hydrogen powered research.
http://www.gm.com/company/gmability/adv_tech/400_fcv/
That's one, and I can find a few more if you like?
As I understand it, the guy at MIT is looking at a process similar to photosynthesis, albeit a lot more advanced and efficient.
Fingers crossed for the future.