Wi-Fi home coverage improves with these gizmos
If you're having making your home Wi-Fi network reach most of your home then this Speedstream solution for you according to a Wall Street Journal story (subscription required):
The product is really two small gizmos that work in conjunction with one another. They're called the SpeedStream Powerline Wireless Access Point and the SpeedStream Powerline Ethernet Adapter. They're small boxes with electrical prongs that you plug into standard wall outlets.
...Essentially, the first device transports the Internet connection over your home's electrical wiring from a wall outlet near your DSL or cable modem to an outlet in the distant room where wireless reception is poor. The second device, located in that distant room, takes the connection from the outlet and broadcasts it wirelessly via a built-in transmitter. The signal is strong because the transmitter is right in the room.