The Best Art Direction Oscar winner 2010 was awarded to the movie Avatar at the 82nd Academy Awards. The nominees for the award were Avatar (Rick Carter and Robert Stromberg, Art Direction; Kim Sinclair, Set Decoration), The Imaginarium of Doctor Parnassus (Dave Warren and Anastasia Masaro, Art Direction; Caroline Smith, Set Decoration), Nine (John Myhre, Art Direction; Gordon Sim, Set Decoration), Sherlock Holmes (Sarah Greenwood, Art Direction; Katie Spencer, Set Decoration), and The Young Victoria (Patrice Vermette, Art Direction; Maggie Gray, Set Decoration).http://oscar.go.com/nominations/nominees#category_art-direction
The Oscar for Best Art Direction honors achievement in visual design. The award can go to either the film's art director, who supervises the design and construction of a film's sets, the set decorator, who translates designs into physical sets used for filming, or the production designer, who manages the art department as a whole.
How to Judge the Best Art Direction Oscar
This video by Slate explains how to judge the Best Art Direction Oscar. The nominees for 2010 were Avatar, The Imaginarium of Doctor Parnassus, Nine, Sherlock Holmes and The Young Victoria.
