Log cabin Home owner (don't you love 'em!) cut in one box for outside light by entry door - has feed, but impossible to pull another wire (fed via door frame)
I seem to remember a 3-way that "talked" over the feed line - like X-10, but can't seem to find it - Leviton if I recall..
Anyone have a better memory than mine - sometimes I think I have a photographic memory, but ran out of film a few years ago <grin>.
Grover, There is also a relatively new wireless switch which does not need any batteries. When you push the switch the mechanical movement generates a radio signal that talks to a small wired module that controls a load. Up to 30 switches can control one load. One switch can control an unlimited number of loads. They are about $60 each for the switch and $60 each for the module. EC&M had a short article in January, 2007 issue. The web site for the switch is www.adhocelectronics.com Anybody tried these out yet? They have been used in Europe for some time.
Geoff, Funny you should ask. The company that actually developed these wireless devices for many different uses such as security systems, building automation, lighting control is a European company. Go to www.enocean.com for more information. They are a spinoff from Siemens. It seems likely that this wireless type of device would work well in post and beam homes that are so popular in Europe.