Entrepreneurs are risking their money to develop everything from hybrid vehicles to home solar-panel systems. Here are some of the best concepts.

Road runner



Steve Fambro was sick of people whizzing past him in the carpool lane, so he decided to do something about it. He set out to design a three-wheeled vehicle -- technically a motorcycle -- that would make it legal for him to drive alone in that lane and be cozy enough for daily commuting. With an infusion of $20 million from Idealab, Bill Gross's business incubator, Fambro's company, Aptera, is scheduled to begin production of the $30,000 electric hybrid later this year. -- Telis Demos