Bram Stoker's Dracula -- a unique Coppola commentary, editing workshop that I want to adapt to DVD format, and an isolated score found nowhere else. I believe DigitalFreakNYC started work on a transfer of the Dracula Criterion a few weeks ago. Nice cover though!

Ghostbusters -- deleted scenes. not sure if they have been released on other releases, but it's one of my favorite childhood movies. This one has already been tackled. Not sure if it was complete though.
http://originaltrilogy.com/forum/messageview.cfm?catid=11&threadid=3550

Boogie Nights - One of their last releases. It has a commentary and documentary that haven't been released on DVD yet.

I believe the commentary was released on the New Line Platinum Series 2-Disc set.

Raging Bull - The CAV edition has a Scorsese commentary that hasn't been released elsewhere. I read somewhere that it is one of the more candid of his commentary.
Taxi Driver - see Raging Bull. same thing.

The Raging Bull commentary IS available on the recent Special Edition released by MGM. Criterion licensed it out to them. However, I would love to hear the Taxi Driver commentary! At the least, if anyone has the LD, maybe they can do a simple audio capture and upload it as a an mp3 file or something.