Folks, Many movies released on DVD have a second supplementary features DVD disc with a lot a background information on the production of the movie, deleted scenes, trailers, and so on. In my personal opinion, the quality of the second disc is quite variable in quality, to say the least. A big problem with the Supplementary Features disc is that navigation can be a confusing and ultimately frustrating experience. I cite for example Disc 2 from the Harry Potter and the Sorcerer's Stone DVD set. Not only is navigation quite confusing, but you have to play a bunch of games just to get to certain parts of the disc, which can be a frustrating experience. A better example of a supplementary features disc is Disc 2 from Star Wars Episode I: The Phantom Menace. There are plenty of very nice background features on the disc, but the navigation system is a bit confusing. In my personal opinion, the best supplementary features disc I've ever seen is Disc 2 from the Collector's Edition set of Atlantis: The Lost Empire. Extremely well-conceived, you can navigate the disc in three different methods, all in a very intuitive manner. It's even set up so you can watch most of the features on Disc 2 as a multi-part documentary on how Atlantis: The Lost Empire was made in a single sitting. So, what you your favorites for a supplementary features DVD disc?