There's a really interesting Ted Talk by Taylor Wilson (perhaps the world's youngest nuclear scientist, and definitely a child prodigy) on thorium reactors as a safer alternative to uranium and plutonium reactors[1].

Apparently there's also this talk[2] by Kirk Sorensen, but I haven't seen that one yet.

[1]: http://www.ted.com/talks/taylor_wilson_my_radical_plan_for_s...

[2]: http://www.ted.com/talks/kirk_sorensen_thorium_an_alternativ...