The Civil Rights Digital Library has oral histories, photographs and videos from and about the movement.
The Internet Archive has a Moving Images Archive where you can download or stream free movies, films and videos. Of the sub-collections, you will probably want to explore the Prelinger Archives since it is categorized by subject area.
Vanishing Georgia (linked from http://www.westga.edu/~library/databases/alldatabases.shtml) has 18,000 photographs from the Georgia Archives.
