Hi there,
Here is a link to a video of me testing a thing - the "Synesthetic Reactor", that gathers data (mostly from photocells) into an Arduino and then sends it to PureData and GEM... another component (not shown in this video) controls a Flash animation using flashserver (got it working yay!).
video here:
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The Synesthetic Reactor, composed mostly of two computers, two Arduinos, and two video projectors, will be at Centraltrak in Dallas, Texas, opening Saturday March 28th 2009 from 6 - 8 pm. The show will run through May 12th.
http://www.utdallas.edu/centraltrak/images/popups/Setina-popup.jpg