Titus from Fox.
One of their two disc specials. Not only do you get an awesome version of a Shakespearean play (Titus Andronicus), the commentary is excellent, the documentary is in-depth, with interviews of the entire cast, plus scenes of rehearsals and cast meetings, and also a look at Rome's Cinecitta studios. There's also a question and answer session with director Julie Taymor before an audience who had just seen the movie at Columbia University (I think it's Columbia). There's a text interview with the cinematographer and so much I just can't remember it all right now.
Also, this is one title Fox is unlikely to re-release in a one disc version, and I doubt the original sold very well, so it's collector value is likely to increase because people who like this movie (like me) REALLY like this movie.