This is just what I happen to have within my current view. I have some more, but they're in other rooms.
Live Action:Batman (1966)
Batman (1989)
Batman Begins
The Dark Knight
Batman and Robin (one of the old serials)
Daredevil
Daredevil: Director's Cut
Demolition Man
Fantastic 4
First Blood
Incredible Hulk (last movie)
Incredible Hulk (TV series pilot)
Incredible Hulk Returns
Trial of the Incredible Hulk
Iron Man
Lord of the Rings: Fellowship of the Ring
Lord of the Rings: Two Towers (extended)
Lord of the Rings: Return of the King (extended)
Lone Ranger (part of the old TV series)
Masters of the Universe
Superman the movie
Superman Returns
Adventures of Superman Season 3 & 4
Spider-Man
Spider-Man 2
Spider-Man 3
Star Trek: Nemesis
Star Wars Episode III: Revenge of the Sith
Transformers
Unbreakable
X-Men
X-Men III: The Last Stand
A four volume set of Red Skeleton
...and two season sets of Smallville, but I forget which seasons because they're in the other room. I think 2 & 3. I haven't watched them yet.
Animated: (actually, I think this is all I have on these)
Batman: Gotham Knight
The Batman - season 3, but one disc doesn't play (and of course that disc has the episodes I really wanted!

)
Scooby Doo meets Batman
Dragonlance
Garfield as Himself
Garfield Fantasies
Garfield Travel Adventures
Justice League: Justice on Trial
He-Man (old series) 10 Best Episodes
He-Man (last series) seasons 1-3
Legend of Zelda (3 episodes, I think)
Prince Valiant volumes 1 & 2
Superman (the old 1940s cartoons)
Thundercats - season 1 volume 1 and season 2 volume 1
Transformers: the Movie (original DVD & remastered)
Ultimate Avengers
Voltron Collection Five (just got this one, haven't watched it yet)