Skip Elsheimer and the A/V Geeks maintain an archive of over 20,000 16mm educational and industrial films. They show the films across the U.S. and make films available on DVD and online at YouTube, Google Video and the Internet Archive.
I particularly like "Goodbye to Garbage", a promotional film for General Electric's Dispose-All, which has some really cool slow-motion shots of the disposer in action.
Link to Skip Elsheimer intro on YouTube. Link to A/V geeks Website. Link to the A/V Geeks at the Internet Archive.