Knock some sense into your computer with an HDAPS-aware kernel, an accelerometer-enabled laptop, and this Perl script.
FTA, "For the first time, you can hit your computer and get a meaningful response! Using Linux and the Hard Drive Active Protection System (HDAPS) kernel drivers, you can access the embedded accelerometers on Lenovo (formerly IBM) ThinkPads, then process the accelerometer data to read specific sequences of "knocking" events -- literally rapping on the laptop case with your knuckles -- and run commands based on those knocks. Double tap to lock the screen, and knock in your secret code to unlock. Tap the display lid once to move your mp3 player to the next track. The possibilities are endless", Read more at IBM developerworks...
Good stuff, but mostly it will work with IBM laptops only.
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