We used VDMX to control live the Tangible Pixels we make
Here is a video of a test
http://vimeo.com/3649718
And here a bad video of a live set
http://vimeo.com/1191398
Photo of the pixel here
http://farm4.static.flickr.com/3639/3354770692_4b116f2337.jpg?v=0