Must Have

Product Description (taken from here):
Voldemort is tightening his grip on both the Muggle and wizarding worlds and Hogwarts is no longer the safe haven it once was. Harry suspects that dangers may even lie within the castle, but Dumbledore is more intent upon preparing him for the final battle that he knows is fast approaching. Together they work to find the key to unlock Voldemort's defenses and, to this end, Dumbledore recruits his old friend and colleague, Professor Horace Slughorn, whom he believes holds crucial information. Even as the decisive showdown looms, romance blossoms for Harry, Ron, Hermione and their classmates. Love is in the air, but danger lies ahead and Hogwarts may never be the same.
The Blu-ray disc of Harry Potter and the Half-Blood Prince will feature Warner Bros. Maximum Movie Mode, an interactive viewing experience that examines the entire film with such features as Focus Points, Picture-in-Picture, photo galleries and more. Maximum Movie Mode includes commentary from director David Yates, producers David Heyman and David Barron, and stars Daniel Radcliffe, Rupert Grint, Emma Watson and Tom Felton.

Harry Potter and the Half-Blood Prince on DVD

The disc also includes Warner Bros. BD-LiveTM, which allows users with web-enabled Blu-ray players to access exciting additional content and connect and share with other BD-Live users via the My Commentary and Live Community Screening features. Another feature of the BD-Live interactivity is Facebook Connect, which allows users to interact with their friends from Facebook, update their Facebook status while in BD-Live and invite their Facebook friends to a Live Community Screening.

Info (taken from here):

Actors: Daniel Radcliffe, Rupert Grint, Emma Watson, Jim Broadbent, Elarica Gallacher
Directors: David Yates
Writers: J.K. Rowling, Steve Kloves
Producers: David Barron, David Heyman, Lionel Wigram, Tim Lewis
Format: Color, Dubbed, Special Edition, Subtitled, Widescreen
Language: French (Dolby Digital 5.1), English (Dolby Digital 5.1), English (Dolby TrueHD 5.1), Spanish (Dolby Digital 5.1)
Subtitles: English, French, Spanish
Aspect Ratio: 2.35:1
Number of discs: 3
Rating: PG (Parental Guidance Suggested)
Studio: Warner Home Video
DVD Release Date: December 8, 2009
Run Time: 135 minutes