Film.com reports the Zodiac Director’s Cut has today been released on Region 1/North American DVD and and HD-DVD. No word on a Region 2/European release, but those interested in the R1 release can purchase it fot $23 at Amazon.com. From Film.com:

Out now in standard def and HD DVD, this Director’s Cut edition — packaged unnervingly in a case that recreates one of the Zodiac’s letters to the San Francisco Chronicle — adds a few minutes to the original cut, with no fundamental changes impacting the new running time of 162 minutes. (Andrew Fitzpatrick details the Director’s Cut additions at his blog The Blood Spattered Scribe.) The image (anamorphic 2.35:1) and DD 5.1 audio are quite good, identical to last July’s bare bones DVD.

Where this new edition really shouts out is through its second disc and quality extras. On tap are two commentary tracks: a solitary track by Fincher and a composite track with Gyllenhaal, Downey Jr., Brad Fischer, James Vanderbilt and novelist James Ellroy. The extras on Disc 2 are separated into two categories: The Film and The Facts. The first group holds “Zodiac Deciphered,” an hour-long, eight-part examination of the production, beginning to end, with behind-the-scenes footage of rehearsals and shooting. “The Visual Effects of Zodiac” gets into the surprisingly complex CGI work that went into such a grounded, beneficially “old school” film. “Previsualization” presents three before-and-after clips showing how Fincher used computer animatics to plan his production. Under The Facts we get “This is the Zodiac Speaking,” a feature-length comprehensive documentary about the real-life events that inspired the movie, with interviews with actual investigators and surviving victims. Then a 42-minute featurette, “Prime Suspect: His Name Was Arthur Leigh Allen,” collects interviews with people who have reason to believe that they know who the Zodiac was.