The ZBar application was designed to be a small tool for those who use multiple monitors. If you have two more more monitors, then Windows only puts the task bar at the bottom of one of those monitors, and although you can move windows to the second monitor, the task bar button for those windows still lives at the bottom of the primary monitor.   

Here are some key features of "ZBar":

· Put a taskbar across bottom of all non-primary screens, in three styles, with optional clock
· Provide control-alt-z and control-alt-x keyboard shortcuts to move windows one screen along
· Organise your desktop wallpaper one image per screen or one image across all screens