I found this Newsweek article on Digg. It makes a very good case for coal being the next major energy source in the U.S. and possibly the world.
Not only would a car run 30% cleaner on CTL (Coal to Liquid) fuel, but they can capture C02 emissions during the manufacturing process to clean that up too. The U.S., India and China could all sustain their own transportation needs with the coal they have in their respective countries which makes for greater national energy security and less reliance on foreign oil sources.
Oh. And it would be about 25% cheaper than oil.
Check it out. It's a quick, good read.