Ethanol as a power source. Synthesized from a prarie of native grasses, with American Buffalo grazing and giant windmills spinning overhead. Could be cool, right? My friend Timothy DenHerder-Thomas has some interesting power points on such a scenario (focusing on the prairie part) which you can find here: http://biocon.fr.umn.edu/people/interns/interns.html
And Will, the author of Human Iterations, was telling me about bittorrent. Which I sort of knew about, but am now pumped on.