The 2008 Nebula Award winners have been announced. Ursula K. Le Guin won Best Novel for Powers and Wall-E won best screenplay. Here's a list of the 2008 winners.
Best Novel: Powers by Ursula K. Le Guin
Best Novella: The Spacetime Pool by Catherine Asaro
Best Novelette: Pride and Prometheus by John Kessel
Best Short Story: "Trophy Wives" by Nina Kiriki Hoffman
Script: Wall-E, Screenplay by Andrew Stanton, Jim Reardon, Original story by Andrew Stanton, Pete Docter
Andre Norton Award: How a Girl of Spirit Gambles All to Expand Her Vocabulary, Confront a Bouncing Boy Terror, and Try to Save Califa from a Shaky Doom (Despite Being Confined to Her Room) by Ysabeau S. Wilce
Solstice Award: Kate Wilhelm, A.J. Budrys and Martin H. Greenberg.