In the last few months the Dr Gonzo Trilogy has been posted there along with the Supplemental disk.
Also posted has been the Wookie Groomer SplitScreen Trilogy, the TR47 Trilogy, the Row47 Trilogy, various Holiday Specials, The Forgotten scenes, the documentary When Star Wars Ruled The World, Making of a Trilogy 1 and 2, The Muppet Show, The Clone Wars and the EditDroid ANH.
Not forgetting numerous comics, books, e-books, audio books, pictures, mp3 files, avi/mov/mpeg files, artwork, disc covers and games........
Promised shortly is the Dr Gonzo Trilogy (again) and the GKar SE Trilogy.
Check out the "Usenet Tutorial?" thread in the Original Trilogy Preservation forum