The Bloom box FEB 23 2010
I'm happy to be wrong about this but it sounds far-fetched and cold fusion-y:
The Bloom box is a new kind of fuel cell that produces electricity by combining oxygen in the air with any fuel source, such as natural gas, bio-gas, and solar energy. Sridhar said the chemical reaction is efficient and clean, creating energy without burning or combustion. He said that two Bloom boxes - each the size of a grapefruit - could wirelessly power a US home, fully replacing the power grid; one box could power a European home, and two or three Asian homes could share a single box.
But the article says that several commercial Bloom boxes are already in use at Google, eBay, FedEx, and Wal-Mart and VC John Doerr and Colin Powell are on board, so who knows? (via @daveg)