An alarm for MacBook and MacBook Pro!
I remember a few years ago when I had to use a separate device as an alarm when I left my laptop unattended for a few minutes. Things have improved a lot since. A pretty cool application called iAlertU uses the MacBook or MacBook Pro built-in accelerometer as an alarm. The application is enabled and disabled using the Apple Remote. I assume the application is set with a particular remote, just like the OS, to stop anyone from disabling it with any remote. The application can also use the built-in iSight to take picture when the alarm goes off. You can learn more about iAlertU or download it here from MacUpdate.