I keep thinking about trying out those devices, like Netgear's HomePlug adaptors, that turns an electrical outlet into a broadband Ethernet port for room to room LAN conectivity without running Ethernet cabling!
If you're interested in doing this as well, I just came across a "don't do what I did" reminder: don't plug these adaptors into a surge protector. The surge protector blocks the surges … which is exactly what is used to transmit the data!
Ethernet over Power