Fiction by Veronica Roth.
This is a cool YA fantasy based in a future society that seems perfect but --SURPRISE!-- actually isn't. (Wait, where have I heard that?)
It's a good story and should be a cool movie--COMING THIS MONTH!!
I'm looking forward to the next book in the series, and sitting on the waiting list at the library.
Other good YA dystopian-future books:
The Hunger Games by Suzanne Collins (duh)
The Giver by Lois Lowry
Uglies by Scott Westerfeld
Matched by Ally Condie