"This is the Zodiac Speaking" (2009)

Even though this is actually on the second disc of David Fincher's excellent "Zodiac" film, I decided to give it a unique review, since it's basically a second movie - a feature-length documentary about the Zodiac killings featuring interviews with the real-life participants and archival footage and photos.

This documentary, featuring the real photos and people, is somehow even more frightening than Fincher's film.  There is a wealth of interview footage from policemen, people who knew the victims, and old news footage to tell the story of the killings.