Below is a list of my favorites from 2012. They are in no particular order.
Divergent and Insurgent by Veronica Roth
The Hunger Games and Catching Fire by Suzanne Collins (I didn't love Mockingjay enough to reread it)
The Girls by Lori Lansens
Gone Girl by Gillian Flynn
Love, Aubrey by Suzanne LeFleur
Miseducation of Cameron Post by Emily Danforth
The Year Money Grew On Trees by Aaron Hawkins
The Mysterious Benedict Society by Trenton Lee Stewart
One Crazy Summer by Rita Williams-Garcia
Pippi Longstocking by Astrid Lindgren
Powerless by Matthew Cody
Ninth Ward by Jewell Parker Rhodes
The Tortilla Curtain by T.C. Boyle
The Road by Cormac McCarthy
Trash by Andy Mulligan
Wonder by R.J. Palacio