Here's one for the Green Dilemma bin: researchers at the Idaho National Engineering and Environmental Laboratory have shown that they can crack hydrogen from at a conversion rate of 45-50% (compared to ~30% for conventional electrolysis) by adding heat to the process, 1000°C worth -- the kind of heat one gets from a so-called "Generation IV" nuclear reactor. Green Car Congress has a terrifically-detailed write-up of the research, including this provocative line: "According to INEEL, a single next-generation nuclear plant will be able to produce in hydrogen the equivalent of 200,000 gallons of gasoline each day."
The two big hurdles for the advent of the Hydrogen Economy are the price of fuel cells and the availability of hydrogen. While research continues on improving solar->hydrogen technology, the reality is that hydrogen fuel is expensive to make in quantity. What if the most cost-effective way to make enough hydrogen for fuel cell vehicles required nuclear reactors?