As most of the dvds we have in our local dvd shops are either the Malaysian reprints or some damn pirated ones but I have managed to buy some original dvds from e-bay at my best possible way. Therefore I have very few original dvds with some good features in my collection (that may be very lame in compared to yours:o ):
Halloween (Limited Edition Holograph Cover)
 Special Features:
Special Features: Biographies, Trailers, Interviews, Behind the Scenes, Image Galleries, Featurette.
Tenebrae Uncut-Uncensored-Widescreen edition
 
    * "An Eye For Horror" (60 minute documentary "An Eye For Horror" which documents Argento's career and features interviews with Dario Argento, John Carpenter, George A. Romero, Tom Savini and Asia Argento)
    * Audio commentary by director Dario Argento , composer Claudio Simonetti and journalist "Loris Curci"
    * Two behind-the-scenes segments (Special effects equipment, Sound Effects) Interview with Dario Argento
    * Alternate End Credits Music
    * Theatrical Trailer
    * Theatrical trailers for other Argento titles
Don't Look Now - Special Edition
 Special Features:
Special Features: 
Exclusive commentary from director Nicolas Roeg, 
Interview with composer Pino Donnagio,
A Looking Back featurette with director Nicolas Roeg and his cinematographer and editor,
and a 16 page booklet.