Well, we just recently had a thread about concert DVDS, but I'm watching Escape 81 right now and just wishing there was more interview footage on there. I love watching good interviews. Anyway, list some of your favorite concert DVDs with great extra features, particularly interviews, commentaries, or documentaries.
America - Live at Sydney Opera House - Good interviews
Dream Theater - All three of their DVDs have interviews, bonus songs, concert commentaries and other stuff, love it
Bachman-Cummings First Time Around/Guess Who Running Back Through Canada - Rehearsal footage and interviews and such... plus Burton Cummings is a great candid interview
Those are a few I can think of. Let me know your picks guys, I'm particularly interested in good interviews, but any DVD with a lot of good stuff beyond the concert is fair game.