Vent your electric dryer indoors during the winter to save on electricity (no cold outside air entering dryer to replace the vented air), and gas (heat is released into the house). WARNING: Electric dryers in dry climates only! (The steam released into the air is great in Utah, but will foster mold in more humid places.)
Indoor Dryer Vent Kit $15. Mine is connected to an exterior vent but this seems like a great way to get your money out of using your electric dryer in the winter since venting it INSIDE means you get to keep the heat it creates (plus its "wet" heat). Double smart. I would totally switch the vent twice a year for that!