The Apollo Lunar Surface Journal is an amazing resource that makes available full transcripts of the entire radio transmissions between the Mission Control Center in Houston and the astronauts on the moon, for each of the 6 Apollo missions that landed there. The journal also includes extensive commentary, references and supplementary information, as well as audio and video files.
Spacecraft Films is a company that sells DVDs containing the entire footage made of each Apollo mission. It's another amazing resource.
If you combine both, you get this: a script that takes ALSJ transcripts, extracts the dialogue from it, along with timestamps, and generates subtitles that can be played over the Spacecraft Films videos. Yielding, if nothing else, a very cool screensaver.