Ceiling Fans In Winter? Yes!
Using a ceiling fan in a clock-wise direction on low speed during the winter can help lower energy consumption by up to 15%. The air near the ceiling of a room is warmer than the air near the floor so a ceiling fan can help push the warmer air that is trapped near the ceiling back down the walls and into the room. Now that the warmer air is where it's needed, the heating system doesn't have to work as much to warm the room.
See Also: How do I know what direction to set my ceiling fan?