The archives of The Evangelical Lutheran Church in America offers a marvelous historical service by providing a number of films on its website. Drawn from the middle and latter twentieth century, these films touch on mission, theology, the Lutheran World Federation, and difficulties in The Lutheran Church--Missouri Synod, among other themes.
The Seminex stuff is dynamite. However, I must admit that my favorite is "The Difference"--a movie that encourages young people to attend Lutheran colleges because of "the difference." It is a great time piece! Watch it and tell me, just what is the difference? (With thanks to Dr. Walter Sundberg for putting me on to the movie in the first place!)
The listing of viewable films may be found here at the ELCA archives