How can I spread a wallpaper out to 2 displays? I have an early 2011 MBP powering 2 Thunderbolt displays. I have downloaded the proper resolution wallpapers from Digitalblasphemy's site (5120x1440), but can't figure out the setting to spread the wallpaper across both displays.

How do I spread the wallpaper across both displays?
Natively in Mac OS X, you cannot spread a wallpaper over two displays in this fashion. You'll need to use Photoshop or your preferred photo manipulator to split the image in half and apply the wallpaper to the individual displays in System Preferences.