If you use multiple monitors and are tired of seeing your background wallpaper repeated on both screens, a utility you might be interested in is DisplayFusion.

With DisplayFusion you can add a taskbar to every monitor that works and looks just like the Windows Taskbar. Or take advantage of advanced multi-monitor wallpaper support, Flickr integration for image searching and fully customizable window management hotkeys. These are just a few of the many things that DisplayFusion can do.

This free utility adds lots of functionality and shortcuts for multiple monitor setups, including taskbar and wallpaper spanning. While some of the shortcuts are built into Windows 7 (the snapping functionality), the additional bundle of features are worth a look.