You can use the Arduino board to automate your wireless switching. I wrote some code to send serial data to the board, switching on some LEDs wirelessly.
Download this file containing the Arduino code and the transmitter/receiver schematic. These are also available at the Flickr set for this Howto.
Materials needed:
1. Arduino board and USB cable (A-B)
2. two solderless breadboards
3. four LEDs
4. four 220 ohm resistors
5. four 10K ohm resistors
6. RF transmitter/receiver and encoder/decoder pairs, I'm using these
7. wire and twiddly bits (power adaptor, 5v regulator)
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