I found the specs for the TAXI DRIVER Limited Collector's Edition DVD:

-“Martin Scorsese on Taxi Driver” Featurette
-“Producing Taxi Driver” Featurette
-“Influence and Appreciation” Documentary
-Robert De Niro, Oliver Stone, Roger Corman and others pay tribute to Scorsese and the film
-“God’s Lonely Man” Documentary
Writer Paul Schrader and Professor Robert Kolker discuss the loneliness themes as seen in the film. Schrader also talks about what circumstances lead to writing the screenplay
-“Travis’ New York Locations” Featurette
An interactive map with visits to the famous New York City locations in 2006, while comparing them to the same locations in 1975.
-Storyboard to Film Comparisons with Martin Scorsese Introduction
-New Feature-length Commentary by Writer Paul Schrader & Director Martin Scorsese
-New Feature-length Commentary by Professor Robert Kolker
-“Taxi Driver Stories” Featurette
-“Making Taxi Driver” Documentary
-Animated Photo Galleries
-“Including Scorsese at Work” Photo Montage
-Original Screenplay Read Along

Source: DVD Times

WOO HOO, a commentary track with Marty