Techgage posted a review of Actiontec's power-line ethernet adapter.

Looking for an alternative solution to a wireless LAN or drilling holes in the walls for a clean wired connection? The Actiontec AV200 might be of interest, with the ability to create a network using the power sockets already in your house. As it turns out, it's effective, and incredibly easy to set up.

Actiontec MegaPlug AV200 Mbps Ethernet Adapter Review