Windows does not handle wallpapers for Dual Monitors very well. If you ever tried to use different wallpapers on each monitor or stretch a wallpaper across both you know what I mean. We - again - have to rely on third party software to add functionality to Windows that the core operating system is missing.
Display Fusion can be used to manage dual monitors, or even triple or more monitor systems, on Windows XP and Windows Vista (Update: the latest version of the program is fully compatible with newer versions of Windows such as Windows 7 or Windows 8). The basic option is to choose either a wallpaper for each monitor separately or choose an image or color that spans across all monitors. This is a feature that should have been implemented in Windows Vista but I guess Microsoft had enough work to implement drm in Vista and forgot about that along the way.
Another option of Display Fusion is the ability to choose that the wallpaper should fit the width or height but remain aspect ratio which is great if you want to use non-widescreen wallpapers on widescreen monitors for instance.
A bonus is the integration of Flickr which lets you search for and download wallpapers from the popular image portal.
Display Fusion integrates shortcuts nicely which add several functions that make it easier to work with dual monitors. Some hotkeys include the ability to move windows to the next monitor in line, stretch windows across all monitors and moving windows to the center of the current screen.
Update: Please note that a free and several pro versions of Display Fusion are now made available by the author of the program. The free version lacks several features of the pro version including all multi-monitor taskbar features the program makes available and options to load wallpapers from remote sources.
Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.