Powerline is a sort-of standard for data networking over an existing electrical system. I already had a Powerline adapter (this one) that’s plugged into my router, so I simply plugged the Powerline wireless access point into an AC outlet in the kitchen and configured it up by plugging an Ethernet cable between it and my laptop. In a matter of minutes, our kitchen had Internet that is good enough for streaming HD video. I’m going to get another one for our living room.
Image: Networking Reviews