Plug-In Hybrid Cars?

I travel about 45 miles to work and 45 miles home from work every day. My little 2000 Oldsmobile Alero is starting to feel the miles, so I am starting to think about my next car. With this commute and the high price of gas, I am growing more and more interested in a hybrid car like the Toyota Prius or Honda Civic Hybrid. Great fuel efficiency, and a great gadget as well. So far, most of what I read is good, except that Hybrids do not do nearly as well as normal cars in snow and ice. Well, there is another kind of hybrid in development now called a "Plug-In Hybrid" or PHEV These take the hybrid gasoline and electric combo to a new level. The idea is that allowing the plugging in of the PHEV overnight means the gasoline engine is needed even less for acceleration assistance. This means fewer emissions, fewer tanks of gas, and only refilling once a month! Of course, one does have to wonder if this really reduces overall emissions, since it is often coal or oil-burning generators that power the house.