If you can watch only one, watch Eyes on the Prize

Other documentaries worth watching:

http://newsreel.org/video/RACE-THE-POWER-OF-AN-ILLUSION

These documentaries are harder to find:

The Lost Year: The Untold Story of the Year Following the Crisis at Central High School, 2007

The Adventures of a Radical Hillbilly: An Interview with Myles Horton by Bill Moyers, 1981

Journey to Little Rock: The Untold Story of Minnijean Brown Trickey, 2001

Fictionalized accounts for adults:

Movies for children: