This time it's thorium in conjunction with a laser and a steam
turbine. Not exactly right around the corner unfortunately but the
potential is very interesting:

"A 250-kilowatt unit (equivalent to about 335 horsepower) weighing
about 500 pounds would be small and light enough to put under the hood
of a car, Stevens claims. And because a gram of thorium has the
equivalent potential energy content of 7,500 gallons of gasoline, LPS
calculates that using just 8 grams of thorium in the unit could power
an average car for 5,000 hours, or about 300,000 miles of normal
driving."

More he

http://www.txchnologist.com/2011/the-thorium-laser-the-completely-plausible-idea-for-nuclear-cars

It's good to know that there are people thinking way out of the box on
ideas like this. Imagine being able to power your boat for 5,000
hours on 8 grams of fuel.