D-Link have created the DHP-301 which is is hardware which plugs in to the wall and then uses the power cables to transmit information across. This is great for those who do not have or want wi-fi, but also do not have the time to lay networking cables. The kit comes with 2 adapters and costs $219.99. Network speeds of up to 200Mbps are possible through this network set up.
Via: OhGizmo