Our family has a tradition of driving around to look at houses with outrageous Christmas lights. This year we made visit to: 1439 Joel Drive, Ft. Washington, PA 19002. This house has quite a number of animated displays. In fact, this is the 28th (and last year!) this family is doing their display. Check them out if you are in the area.
If you know of any fabulous light shows in the Philadelphia area feel free to post addresses as replies to this post.