Theft prevention.

Short of having one of these...

[ame="http://www.youtube.com/watch?v=xGPVD2Fdh0k"]YouTube - Trunk Monkey 2[/ame]

...I like the idea of switching the coil negative wire. I was also thinking of armoring the ignition wires under the dash to prevent hot-wiring. I have also heard of anti-tilt mercury switches with alarms; however, it seems that someone leaning against the car sometimes sets them off. I will need to do further research.

Thanks for your input, guys.