I wanted to move the Airport Express back to the office to use it as a print server. In order to do that, I needed to find a different solution to bring a network drop down to the living room. I decided to go with the Netgear Wall-Plugged Ethernet Bridge.
The ethernet bridge is very easy to use. You connect on of the to modules into an outlet near a router, and plug an ethernet cable into it. Then you plug the other one into an outlet where you need a network drop.
This works pretty well. In fact the mac mini and the PS2 are connected to this in the living room. I checked the latency going across the bridge, and it was about 2ms. (About the same a wireless).
Also, it is possible to configure encryption for this connection. This would prevent your neighbors from being able to see your network. Unfortunatelly, it uses a Windows application to set this up.
I do wonder how well the signals go across the different phases of the house electrical system. If this is like X10, this would require a bridge across the phases to let the signal go across, with out going to the street first. Maybe this actually transmits both a in-phase and out of phase signal.