Fallout 3, Command & Conquer: Red Alert 3, Dangerous High School Girls In Trouble!, Star Wars: The Force Unleashed and Tomb Raider: Underworld all received recognition from the WGA.
Only games scripted by writers that belong to the WGA were eligible to be nominated. And the WGA charges dues, so who knows how many games they really had to choose from. Still, High School Girls!
The full credit list, via Variety:
Command and Conquer: Red Alert 3 (EA LA). Writer: Haris Orkin. Story Producer: Mical Pedriana.
Dangerous High School Girls in Trouble!(Mousechief). Writing: Keith Nemitz. Additional Writing: Adrianne Ambrose.
Fallout 3 (Bethesda Game Studios). Lead Writer: Emil Pagliarulo. Quest Writing: Erik J. Caponi, Brian Chapin, Jon Paul Duvall, Kurt Kuhlmann, Alan Nanes, Bruce Nesmith, and Fred Zeleny. Additional Quest Writing: Nate Ellis, William Killeen, Mark Nelson, and Justin McSweeney.
Star Wars: The Force Unleashed (LucasArts). Writers: Haden Blackman, Shawn Pitman, John Stafford and Cameron Suey.
Tomb Raider: Underworld (Eidos). Story: Eric Lindstrom and Toby Guard. Screenplay: Eric Lindstrom.