I have NOT seen this doc, but am so blown away by the scene select and the process that I thought I would share. This is The Arbor by Clio Barnard. She created the film out of audio interviews which actors then lip-synched to, verbatim, while acting. It is supposed to screen in NYC sometime this month and am definitely going.
http://www.artangel.org.uk//projects/2010/the_arbor/video_clip/a_scene_from_the_arbor
