This semester I taught a course where Engineers and Artists worked together to create interactive art. For the final project we took over an art gallery and built a virtual environment using 12 computers, 12 speakers, 12 projectors and several Arduinos. We built and networked everything in Pd/GEM. Unfortunately the video doesn't capture much of the very cool sounds of the environment, but at least you will see the networked sparklers running in GEM.
I hope you enjoy: http://vimeo.com/994958
I am so grateful for Pd as a resource for me, my classes and my community. I send this hoping that perhaps a developer or 2 will find it gratifying to see some of the work that we are able to accomplish with this amazing tool.
-John