The USC Scripter nominees honor both the source material and the finished script. Their nominees as follows:
screenwriter Christopher Hampton for A Dangerous Method, adapted from the nonfiction book A Most Dangerous Method: The Story of Jung, Freud, and Sabina Spielrein by John Kerr and the 2002 stage play The Talking Cure by Hampton
Screenwriters Alexander Payne, Nat Faxon, and Jim Rash for The Descendants, adapted from Kaui Hart Hemmings’ novel (itself an expansion of her first published short story, “The Minor Wars”)
Screenwriter Moira Buffini for Jane Eyre, adapted from the 1847 book by Charlotte Brontë
Screenwriters Steven Zaillian, Aaron Sorkin, and Stan Chervin for Moneyball, based on Michael Lewis’ book, Moneyball: The Art of Winning an Unfair Game
Screenwriters Bridget O’Connor and Peter Straughan and author John le Carré for the thriller Tinker, Tailor, Soldier, Spy.
Thanks to @jtfoix for the reminder