I won't have seen the documentary before posting it, so if it sucks it's not my fault. I'll be just as disappointed.
Here's the one I'll be watching tonight:
[Video: http://video.google.ca/videoplay?docid=8524267568796529301]
It's a scientific analysis of footage from NASA missions/satellite photos of the earth's atmosphere having odd objects moving around in it, and how it might be UFOs.