re: IMAX Space Station DVD
"Needless to say, the word "Columbia" was not mentioned once."
Because the Imax ISS movie was finished long before Columbia was lost - and Columbia, being the oldest and thus heaviest Shuttle - was never sent to the ISS.
Since the first Shuttle-ISS flight, Columbias three missions were STS-93 - Chandra X-Ray Observatory deployment, STS-109 - Hubble Servicing, and of course STS-107
Doug