I made a reactive light and sound installation recently while artist in resident at Ciant (www.ciant.cz)…
It’s called Stutterspot;
http://vimeo.com/11846785
A little more info here:
http://www.digitalstar.net/art/stutterspot/
I wrote some DMX code based on an SDK for this DMX interface, and I will post it soon:
http://dmx512.svetla.org/dmxpipe-en.htm
…its here: