In the original screenplay category, the films and their authors are Burn After Reading (Joel Coen and Ethan Coen), Milk (Dustin Lance Black), Vicky Cristina Barcelona (Woody Allen), The Visitor (Tom McCarthy), and The Wrestler (Robert Siegel). The Coens won WGA awards for Fargo and No Country for Old Men, and Allen has won four times, most recently for 1990's Crimes & Misdemeanors.
For adapted screenplay, the nominees are: The Curious Case of Benjamin Button (Eric Roth), The Dark Knight (Jonathan Nolan and Christopher Nolan), Doubt (John Patrick Shanley), Frost/Nixon (Peter Morgan), and Slumdog Millionaire (Simon Beaufoy). Roth previously won this award for Forrest Gump, and Shanley won for Moonstruck. If you're wondering, The Dark Knight counts as "adapted" because it uses pre-existing characters. (The Oscars have the same rule.)
What does this mean for Oscar-watchers? In the adapted category, of the 120 nominees since 1984 (prior to that the WGA had separate categories for drama and comedy), 90 of them -- 75% -- have also been nominated for Oscars. But 11 of those WGA-but-not-Oscar nominees have happened in the last eight years alone, and some folks think the WGA-omitted Revolutionary Road and/or The Reader might get some Oscar love.
The original screenplay category is almost exactly the same story, with 31 WGA nominees not getting Oscar nods, 14 of those in the last eight years. Among the much-praised original screenplays that might get Oscar attention despite being overlooked by the WGA are Rachel Getting Married and Synecdoche, New York.
The WGA awards will be announced Feb. 7. You can see the entire list of nominees, including documentaries and TV shows (yay 30 Rock!), here.