918 RSR still takes that crown, but the Veritas RSIII Roadster Hybrid is certainly no wheezy commuter. It's a tiny, open-topped racer that features a 507HP V10 from BMW that's been paired with a 105kW motor to spin the front wheels. It's much the same arrangement of the Porsche, again relying on a KERS flywheel to generate electricity that's stored in a Li-ion battery pack, which can also be charged separately. The car can actually limp around for up to 31 miles powered by just that front motor, but when both sources of thrust are called upon the sled gets to 62MPH in 3.1 seconds, as fast as a 911 Turbo S, and it'll keep on going until the speedo hits 205 -- or the car hits something immovable. No word on price or availability, but there is a version with a roof coming this summer, and a fully-electric model due in 2013.