Toyota Motor Corp. said it will start selling a plug-in electric hybrid in 2010… The same year that General Motors promises to start selling its electric car, the Volt. Excited? I wouldn’t hold my breath. GM has been talking about making an electric car for years now, and it’s not much closer today than it was in the beginning. All the major car makers have the know-how to start building electric cars. They’ve just been incredibly reluctant to take the leap. But supposing the big auto makers have indeed found electric car religion (with a little help from $135 a barrel oil), then a real transportation revolution could be underway–and it could happen much sooner than anyone might have guessed. With affordable, mass market cars on the horizon, we could be headed for the kind of change not seen since the Model T replaced the horse and buggy.