Mark it down, folks -- it's a monumental day. In a way, this marks the end of one of the longest running sagas covered at Engadget, but in reality, it's probably the start of something else entirely. Chevrolet's Volt was once the starlet of the electric vehicle universe. And then 2009 happened. In the meanwhile, legions of other automakers have moved forward with hybrid and pure electric plans, with Tesla's Roadster heading out to thousands of motorists and Nissan's
