Thorium, which was abandoned in favor of Uranium due to its production of nuclear grade Plutonium, is now working to be the Green Nuclear Fuel of Choice.
Uranium Is So Last Century — Enter Thorium, the New Green Nuke
Long live our new Thorium overlords.
http://www.guardian.co.uk/environment/2010/jan/10/nuclear-power-irrational-fears#start-of-comments
Personally, I think we need Fast Sodium Reactors. They can use up the Nuclear fuel and generate energy in the process. Also less material for someone to turn into a dirty nuke.