I don't know if this was mentioned before but a new protocol is
emerging called CEBus. This is supposed to handle things like home
automation using many transmission mediums including power lines. I
don't know if anything is available yet.

Try

http://www.intellon.com

http://www.cebus.org

http://www.hometoys.com

Tony


Just when I thought I knew it all,
I learned that I didn't.