This site also has another old style that was popular around here it was called the Remcon Relay system. You would install the little relay in the box which fed you light and you ran a small low voltage wire down to the switch. It was momentary on/off to get your light to work. The best thing about this system, was that you could run 3, 5 ,6 or 8 switches down by your front door and you could use it as a master switch to turn on outside lights, garage lights, front door lights, and walkway lights all from the front door.
Here is some of their equipment:
http://www.tequipment.net/RemconR-115S-5Pack.html
