MultiMonitor Taskbar PRO

From Mediachance:

MM Taskbar is useful if you work with a multi-monitor setup. This tool extends the Windows Taskbar to all of the additional screens you've got set up. The Windows will not extend the TaskBar to the other monitors and all windows will be shown on the single windows taskbar on a primary monitor. It has support for Windows XP, Media Center (Royale on XP) and Vista (Royale Noir) themes. Add buttons to resize window across two or three monitors. Move To Monitor buttons on the extended taskbar can move even special windows like Remote Desktop Client. Better handling moving windows across screens with different resolutions. Monitors Remote Desktop and can Suspend itself when you are in RD session, then restore itself after RD session is finished.