Arduino Wireless Remote Light Switch

So I bought this remote control switch from Home Depot a couple years ago and the battery died in the remote, so I could go find a replacement A53G 12V battery, or I could hack it and control the remote using Arduino. That way I can turn the lights on and off by computer, based on time of sunset, etc, which is even better than the remote and exactly what I want. How hard could it be right?

Turns out not so hard, see my blog for the full story and Arduino Source code.