Take a look at this computer-controled Etch-A-Sketch that writes out the time every minute, then automatically flips to clear itself and then records the new time.  I’d like to see a more detailed drawing of what time it is (the simple outline of the line seems a bit plain to me, and also a bit small for the size of the screen), but then again, I’ve never tried to program anything like this, and its probably more complicated then I think.  Either way, its a cool use for a etch-a-sketch.

http://blog.makezine.com/archive/2008/03/etchasketch_clock.html