I came across this article on Helium-3, of which apparently just 40 tons of the stuff could power the entire United States for a full year. Check out the article here:
The catch? Helium-3 is only found in quantity on the moon.
Then we could switch all the US power plants to Helium-3 fusion reactors, which could be safe enough to put in US city centers. Then switch to electric plugin cars with gasoline backup engines like the Chevvy Volt.
Sure sounds good anyway. US $10 Billion/ton. Hmmmm...how do you file for mining rights on the moon anyway? :)