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.
#75384 - 02/28/0703:32 PMRe: 3-way switch - no travellers
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.