There used to be a classic little utility called 'Cylon' that would flash the 4 keyboard lights back and forth on ye olde SparcStations...
...in fact a bit like the Cylon's in Battlestar Galactica!!! :-)
Bing
Also I wondered if it was possible to output morse code on the scroll lock LED.
You can make the keyboard LEDs do lots of fun things! as Neill suggests a quick look on Freshmeat would probably bring up the correct results. and a quick google search says look here http://www.sudac.org/~napolium/linux/ and here http://sourceforge.net/projects/ditdah/
Adam
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