Clearly it's a commercial venture, but they do have news footage of the American Civil Rights Movement that you can watch online without registering which looks good. Useful for those with an Internet connection and projector or interactive whiteboard? (Use the drop down menu under 'Watch a Reel')
The Pandia article says:
...... you can search the archives, watch the clips and even download them all for free. All you have to do is to register and volunteer some information about yourself and I promise it is well worth the effort.
If that's the case it's got to be worth registering. I did a quick search on the 'Vietnam War' and there seems to be loads of clips that would make eg. good lesson starters?