
Downhill Battle — an amazing, energetic, imaginative copyfighting nonprofit group — has spun off something called the Participatory Culture Foundation with the aim of making DTV, an open source video publishing, aggregating and viewing tool: in other words, a TV killers. They've just finished the MacOS beta of DTV (Windows beta to follow soon).
(Thanks, Tiffiniy!) (Disclosure: I am a proud member of Downhill Battle's Board of Directors)