What are some good movie-specific documentaries or supplementals that are available separately on DVD (i.e. DVD's that I could buy without buying the actual movie too)? I'm thinking about stuff like Hearts of Darkness: A Filmmaker's Apocalypse even though that hasn't found its way onto DVD yet. Here are a few others:

The Omen Legacy
The Matrix Revisited
The James Bond Story
Bond Girls Are Forever
The Stars of Star Wars: Interviews from the Cast
R2-D2: Beneath the Dome
National Geographic Beyond the Movie - LOTR: The Fellowship of the Ring
National Geographic Beyond the Movie - LOTR: Return of the King
National Geographic Beyond the Movie - Pearl Harbor
National Geographic Beyond the Movie - Troy
National Geographic Beyond the Movie - Alexander

The Alien Saga

Lost in La Mancha

One of the best: the recently-released BURDEN OF DREAMS

There's a Harryhausen documentary that is available separately... The Harryhausen Chronicles, although it is also included a several of his movies as well.

The Cutting Edge - The Magic of Movie Editing
Frank and Ollie

Boys Don't Cry--The Teena Brandon Story
Monster--there are two documentaries about Aileen Wornous (sp?)

passport put out several of these a while back.

Making of "Bullitt"
Making of "Grand Prix"
Making of "Lawrence of Arabia"
Making of "Lawrence of Arabia"
Making of "The Ten Commandments"
Making of "Westworld"

also
Walt: The Man Behind the Myth

There are also some good documentaries on the Stooges (Three Stooges: The Men Behind The Mayhem) and the Marx Brothers (Marx Brothers In A Nutshell & Unknown Marx Brothers).

There is a 24 documentary about making the tv show. Can't think of the name, there is a review on dvdtalk for it. Sounded extremely interesting. Unfortunately it retails for $75 for this 30 minute documentary, so probably will never be seen in my collection.

Chuck Jones - Extremes and In-Betweens, a Life in Animation

and there are a couple of Walt Disney World exclusives I saw two years back when I was there.

Behind the Planet of the Apes (although it's also included on the 35th Anniversary PotA DVD)

The Sinister Saga of Making "The Stunt Man"

overnight for the boondock saints

apocolypse now has a doc not yet released in the states

and king kong will have all the web docs/diaries on a two disc dvd in france

The Matrix Revisited

PRETTY AS A PICTURE: THE ART OF DAVID LYNCH, though meant to give a career overview of the director, has heavy concentration on the making of LOST HIGHWAY.

Well i am definately waiting for Hearts of Darkness to come out on DVD. Saw it a while ago on TV and really enjoyed it. I can recommend a few. There is teh Stalney Kubrick: Life in Pictures that is excellent, and i recommend many of th books written on Kubrick. There is also a DVD i picked up recently on Ebay for a bargain $2.98 (it is two DVDs as well which is amazing value) called Easy Riders, Raging Bulls. It is basiclaly the screen version ot the book which is excellent reading. It covers the 60's 70s and 80s movie making and all the main players like Bogdonavich, Lucas, Spielberg, Friedkin, Scorsese et al. Lots of amazing interviews with all the main people involved in movies and its really cool. There are also great documentaries on Movie discs themselves. The Mark Kermode docs on The French Connection and The Exorcist are both very good, also the Full tilt Boogie doc with From Dusk till dawn is very good.

I was curious about docs that aren't included on the DVD itself or as part of a box set (like the Alien Quad bonus disc). Stuff that you can buy on DVD separately without having to buy the actual movie too (so no two-packs like the American Pie/Beneath the Crust, Anchorman/Wake Up, Ron Burgundy!, or The Ring/Rings sets since you can't buy those bonus discs by themselves). I'm thinking about stuff like The Matrix Revisited.