The Piksel09 festival is happening in Bergen right now (19 - 22 November). The festival site describe Piksel like this: "Piksel is a festival and community for artists and developers working with Free/Libre and Open Source audiovisual software, hardware and art". A lot of the festival is streamed, so check their site.
Yesterday I saw the dancing instruments of "Action Potential" ( top picture) and "Kunst und Musik mit dem Tageslichtprojector" (picture below). Real nice! Look for more pictures in my Piksel set on Flickr.