5.1 Inception Soundtrack (Disc 2, HD, 39 minutes): Hans Zimmer's pulse-pounding film score is presented in 5.1 surround sound via a captivating DTS-HD Master Audio mix. The only downside? Rather than fill the experience with concept art, production photos or film stills, the screen simply remains black during all ten tracks. Even the option to listen to the score with some sort of visual component would have been appreciated. That being said, I listened to the entire soundtrack while writing my review. Not a bad way to spice up a few otherwise tedious hours.
Dreams: Cinema of the Subconscious (Disc 2, HD, 44 minutes): Joseph Gordon Levitt hosts this initially meandering, eventually engrossing dream documentary which assembles a string of doctors, psychologists, theorists, authors, professors and other experts to dissect the science of sleep. It's a bit pretentious by its very nature, but bear with its shortcomings - it's well worth watching.
Inception: The Cobol Job (Disc 2, HD, 15 minutes): This Inception prequel unfolds courtesy of a beautiful Motion Comic, and explains how Cobb, Arthur and Nash were enlisted by Cobol Engineering. Diehard fans of the film will be especially interested in this one.
Project Somnacin: Confidential Files (Disc 2, HD): Access the "highly secure" tech files and schematics for Inception's dream-share technology through this BD-Live portal.
Conceptual Art Gallery (Disc 2, HD): More than thirty pieces of concept art and pre-production paintings are available.
Promotional Art Archive (Disc 2, HD): Peruse the film's domestic and international movie posters.
Trailers and TV Spots (Disc 2, HD, 16 minutes): A theatrical teaser, two full trailers and thirteen TV spots round out the package.
$40 for an incomplete Steelbook seems too much to me.