I had this idea with conductors and revolving doors. I've seen similar ideas but its all been too high tech. Well anyways, conductors could be put on top of revolving doors to generate electricity. In places like airports, bus terminals, shopping malls, etc. I'd imagine it would help out a bit. Hell, it could even help businesses drive people into their stores, think about it.
I think it would be cool if you could make the conductor throw energy to power generators which then can be shipped to other countries to provide electricity for light, appliances, communication devices, etc. But then, now that I think about it, does that outweigh the jet fuel and smog generated from hauling the generators to these countries? Either way, could be a cool idea.