Yeah, if you want to drive a Hybrid to save money at the pump or to try to reduce dependency on foreign oil, then you kind of have a case. But if you do it because you think it's better for the environment, you're a f'ing stooge. The plug-ins are a horrible idea, as electrical generation is only around 70% efficient w/ all the transmission and conversion losses. And regardless of how it gets the electrical charge, a battery is TERRIBLE for the environment. Production, recycling, and eventual disposal - filthy, filthy stuff.
But hey, hug a tree and drive a Prius if it helps you sleep at night.