This documentary, UFOs-The Secret Evidence, provides a good overview of the UFO phenomenon, including historical footage. There is special emphasis on the Cold war era disinformation efforts, and US secret technology.  It takes a rather conservative view, but clearly admits that some cases are inexplicable. Some of the best evidence, such as the Belgian flap of 1996, or the Rendlesham Forest incident, is not even mentioned. It is still worth viewing for the historical perspective dating from WW2 “foo fighters”, Nazi era experimentation with antigravity, and the link to American high tech experiments. The CIA policy of encouraging UFO sightings in order to help hide secret experimentation is clearly delineated.

You can view it here:

http://atomicnewsreview.org/2009/06/14/ufos-the-secret-evidence/

Enjoy.