I enjoyed watching the American Experience Woodstock documentary, worth a view if you have any interest in the festival and how it came to be. It is also now available on Netflix, too. When I watched it on PBS they were in the middle of one of the endless pledge-drives and it was annoying to have them stop the film every fifteen minutes to ask for money. Last week WXPN in Philadelphia replayed the entire festival in real-time starting each of the sets at the time and date they originally happened.
