Google Nexus S Wallpaper Size
Best resolution for Nexus is 960px x 800px
Check out the sample wallpaper for nexus s sized to 960px by 800px.
Aspect ratio of wallpapers for the Google Nexus S android phone is 6:5 unlike the popular screen 4:3 resolution or 16:9 widescreen aspect ratio. Google nexus S screen resolution is 480px by 800px. The wallpaper size is double this screen resolution to accomodate all the screens.