This is probably like telling water to be wet, but you ought to play Half Life 2 if you like the dystopian genre. And whilst not technically dystopian, but more anti-utopian, BioShock is another good game [loosely put] in the same genre.

If you're looking more at dystopian literature, then have a nosey at:

http://en.wikipedia.org/wiki/List_of...ian_literature

Some very good books on that list - I'm guessing that a few of the early 20th Century writers will be there, like Wells and Orwell.

Just had a lookee, and they've even got the seventh Harry Potter book in the list.