DisplayFusion is application for stretching wallpaper images across your two PC monitors. It can also search for and load wallpaper images from Flickr. This new version is much more stable, and includes hotkeys for moving windows between monitors. DisplayFusion requires the free .NET runtime, and the free version is slightly limited—it doesn't include customizable hotkeys and timed wallpaper changes. (The upgrade will set you back 10 bucks).