Bound For Glory (1976)
This film dramatizes Guthrie's story, apparently with some success and even accuracy.
Woody Guthrie: This Machine Kills Fascists (2005)
This is the heftiest documentary out there on Guthrie's life, clocking in at almost three hours and providing plenty of juicy detail for the Guthrie enthusiast—although, according to some reviews, not enough of the actual music.
American Masters: Woody Guthrie (2007)
PBS documents Guthrie's life as a part of its classic series.