Snag Films just introduced Jerry Aronson's Ginsberg documentary The Life and Times of Allen Ginsberg to their online catalog, which means you can watch it for free! (after sitting through a few ads that is, but we figure that's a small & relatively painless price to pay)
Also worth checking is Life & Times webiste, with clips & outtakes, photos and more..
2012 update - not any more! (old out-dated links, but Jerry's Life & Times website is still active and you should purchase the DVD from there