Already been done (Score 1)

This isn't the first such motion alarm for the Mac. BumpAlarm (of which I happen to be the developer) was an idea that was implemented a little over a year ago. http://www.alcemore.com/blog/2005/03/26/bumpalarm- motion-sensor-for-apple-powerbooks/ http://www.macupdate.com/info.php/id/17684