Microsoft GroupBar 1.2.0.0 

GroupBar is lightweight desktop tool that offers enhanced window management capabilities in a Windows taskbar-like setting. The basic concept is that through simple drag-and-drop operations on window tiles within the bar, users can create lightweight, transient grouping relationships that allow them to perform certain higher-level window layout functions on multiple windows at once. In addition, windows and groups can be persisted in a "Snapshot" which attempts to remember the position and contents of each window in a way that allows the Snapshot to be recreated at a later time, even if the windows have been rearranged or closed.