You can keep your Dark Knights and Tumblers. For my money, the best Batman movie is still Tim Burton's 1989 version starring Michael Keaton, and this 30-minute documentary, shot during filming, reminds us all how ground-breaking the movie was.
How contemporary is it? Well, Tim Burton is portrayed as a wild Hollywood iconoclast, which is hilarious now. Also, it's hosted by Robert Wuhl (he played the reporter Know), who was a pretty popular comedian back then. But seeing Keaton and Kim Basinger and Burton talk about this superhero movie as this crazy, enormous, brand-new entity — well, it's a marvelous look back at a great film and a very happy reminder of how far we've come.