I'm a big fan of dystopian works (not obsession level, but a big fan nonetheless). Here are the titles I've read/watched over the years (some might qualify a little more than others).
Books/Stories
Fahrenheit 451
1984
Brave New World
The Giver
The Hunger Games Trilogy
Movies/TV
I, Robot (loosely based on the premises that Phillip K. Dick and Isaac Asimov set forth in several of their works)
The Hunger Games (saga, later parts are still being released)
Once Upon A Time (TV series)
V for Vendetta
Gattaca
Continuum
Christopher Nolan's renditions of Batman
Arrow (TV series)
I also happened across this list, which is quite a bit more exhaustive (and has a link at the bottom that links to lists of comic books and films):
List of dystopian literature - Wikipedia, the free encyclopedia
The TV show portion of the Wikipedia link also lists the following as dystopian, I've seen them and don't really get where it qualifies as dystopian (I think some of them are listed because of dystopian elements, not necessarily that the whole story is dystopian), but they're pretty good nonetheless and figured I'd vouch for them:
Firefly (and it's movie, Serenity)
Falling Skies
Sliders (a little campy, and the episodes are kind of cookie-cutter, but pretty good, only some episodes are really dystopian, though)
The Walking Dead
Avatar: The Last Airbender (a particular town is kind of dystopian, I guess)
Jericho
I'd considering Falling Skies, The Walking Dead, and Jericho more post-apocalyptic than dystopian, but there are some dystopian elements to them, and they're good series anyway.
If you're into video games, there's also Borderlands and Crackdown (and their sequels), which are pretty good, albeit rather graphic (they are M-rated, just a head's up). Crackdown is a little more dystopian than Borderlands. Borderlands is, in the sense that the planet it takes place on is hyped up as this flourishing, profitable place, when in fact it's a barren wasteland that will drive visitors insane if it doesn't kill them, first.