This article about liquid-fluoride thorium reactors (LFTR) in the Washington Post by Eric Niller makes some good points about converting existing U.S. reactors to thorium fuel, and also about building new reactors that use thorium. There is less waste, thorium is more abundant, and is more difficult to use in nuclear weapons. This is a new concept to me, but I like it so far.
"Nuclear power entrepreneurs push thorium as a fuel"
(an earlier post on the message boards dealt with thorium ... http://www.thomhartmann.com/users/timtrott/blog/2011/04/counter-mat-roth... )