Re: Metal hydrides
Like I said, the idea isn't new. If memory serves, they tested a hydrogen powered city bus in Munich sometime around 1978. I don't have a link to the story, though. I guess it's too old.
From the DOE website I linked earlier in the thread, it seems research into metallic hydride storage hasn't stopped. The newer research into carbon nanotubes is also very interesting. Both sound like much more promising than liquid H2 or pressurized gas storage.