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I bought one of these Arduino 433.92Mhz sender and receiver kits for controlling my Klik Aan Klik Uit en Elro devices. 
They are called "433MHz Superheterodyne 3400 RF Transmitter and Receiver link kit" and can be found on ebay for about $10.

They're connected in the following way:

Sender:
- VCC - 5v
- GND - 0V
- Data - Pin 11 (GPIO 0 in wiringPi)

Receiver:
- VCC - 3.3v
- GND - 0v
- Data 1 - Pin 13 (GPIO 2 in wiringPi)

The sender and receiver are (for now) only compatible with Elro devices, self learning Klik Aan Klik Uit devices (eg. model APA2-2300R) and older Klik Aan Klik Uit devices (eg. model PAT-103).

Receive:
 -s Change the interval speed
 -c Print all values on one line for batch programming
 -d Debug mode

Send:
 -t Send "on" command
 -f Send "off" command
 -u Specify unit code
 -i Specify house id
 -s Change the interval speed
 -a (KaKu) Send the "on/off" command to all units within the same house id.
    This command can be used to turn all devices with the same
    house id "on" or "off".
 -d (KaKu) Dimmed value (1 - 15)
 -r How many times does the code need to be send

Example output:
- Receiver:
root@XBian:/# ./receive
Klik Aan Klik Uit
ID:             5763406
All/Single:     Single
On/Off:         ON
Unit:           2

root@XBian:/# ./receive
Elro
ID:             1
House:          15
On/Off:         On

- Sender
root@XBian:/# ./send -u 2 -i 5763406 -f
Lamp Uit
root@XBian:/# ./send -u 2 -i 5763406 -t
Lamp Aan

root@XBian:/# ./sendElro -i 1 -u 15 -t
Lamp Aan
root@XBian:/# ./sendElro -i 1 -u 15 -f
Lamp Uit

root@XBian:/# ./sendKakuOld -i 1 -u 15 -t
Lamp Aan
root@XBian:/# ./sendKakuOld -i 1 -u 15 -f
Lamp Uit