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I've had that since day one (a-hey-hayges ago), now its built into VirtueDesktops which is much simpler without all this terminal malarkey.
 
This is SOO 6 months ago. Well not really... But still. The program I think is most useful that utilizes the SMS is iAlertU, a security program that triggers an alarm when the macbook(pro) is moved or played with. Pretty cool app. It it armed using the Front Row remote, and it sounds like a car alarm. http://www.slappingturtle.com/home/

Another good (but completely useless) app for this sort of thing: http://www.macsaber.com/

For all you star wars fans... Swing your macbook to make lightsaber sounds.
 
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