Automatically exported from code.google.com/p/rc-switch Project is migrated to github:
Info Send RC codes
Use your Arduino to operate remote radio controlled devices. This will most likely work with all popular low cost power outlet sockets.
All you need is a Arduino, a 315/433MHz AM transmitter (find out where to get one or hack your existing remote control) and one or more devices with a SC5262 / SC5272, HX2262 / HX2272, PT2262 / PT2272, EV1527, RT1527, FP1527 or HS1527 chipset. Also supports Intertechno outlets.
Receive and decode RC codes
Find out what codes your remote is sending. Use your remote to control your Arduino.
All you need is a Arduino, a 315/433MHz AM receiver (altough there is no instruction yet, yes it is possible to hack an existing device) and a remote hand set.