My choices for 2012 are:
Where'd You Go, Bernadette by Maria Semple
What I Wish I Knew When I Was 20 by Tina Seelig
Do you have one, two? Please leave the title and author as a comment.
If you have to go back over your book list for the year, then the book was not exceptional. It has to be one that would come to mind immediately if someone asked you: What was the best book you read in 2012?