There are also Shabbath light switches, JFYI: http://www.kosherswitch.com/live/tech/how http://www.kosherswitch.com/live/tech/how the name says it all, but th

There are also Shabbath light switches, JFYI: http://www.kosherswitch.com/live/tech/how http://www.kosherswitch.com/live/tech/how the name says it all, but the actual way they devised to workaround the issue is IMHO extremely clever: "Our technology revolves around several layers of Halachic uncertainty, randomness, and delays, such that Halachically, a user’s action is not considered to have caused a given reaction."