Scare away the thief stealing laptop by making noise
Editor: A.L.A.R.M. is a free open source (GPL) utility for Windows XP and later. It silently sits in your system tray until you Lock your workstation. If now somebody removes the A/C power connection to steal your laptop, A.L.A.R.M. will play a loud sound from your Laptop speakers until power is back again or you have unlocked your workstation.

Of course, this is Little Protection from theft, but better than nothing if you have to leave your laptop or portable alone for a moment.

Features:

-Small size and low memory footprint
-Easy to use
-Supports many types of media (MP3, WAV, mid, ...)
-Free! you can free download A.L.A.R.M. 1.01 now.