While the concept of fuel cells has been around for years, the technology still has a futuristic ring to it. I'm sure whenever my jet-pack arrives it certainly won't run on double-A batteries. But perhaps a compact fuel cell might be sufficiently cool. In the meantime, the reality of fuel cell technology on the ground in Japan just took a significant leap forward thanks to a joint development by Panasonic and Tokyo Gas that allows home-owners to energize their own house.