Batman '89, Batman Returns, Batman Forever, and Batman & Robin, all in one set
Blade Runner (final cut)
The Blair Witch Project and Blair Witch 2 (ugh), both on one disc
A Nightmare on Elm Street 3: Dream Warriors (finally!)
The Simpsons (Season 6)
Star Trek: The Motion Picture (director's cut)
The X-Files (Season 3)
have all been added to my collection.