Arduino IR Remote Control
This is a good example of hacking devices with Arduino. [sspence65] has put on oa good tutorial to start from something easy and simple: IR hack.
Capturing codes from any tv remote, and using them to control devices attached to Arduino Outputs. Press a button on a TV Remote, and the code appears in the serial monitor, Add that code to the case/switch statements in the sketch to control an output pin.
On the [website] there is the full explanation and code to build the same experience, but nothing prevent you to implement a custom way for your IR devices.