1. Virtua Win
VirtuaWin is a virtual desktop manager for the Windows operating system (Win9x/ME/NT/Win2K/XP/Win2003/Vista). A virtual desktop manager lets you organize applications over several virtual desktops (also called ‘workspaces’). Virtual desktops are very common in Unix/Linux, and once you get accustomed to using them, they become an essential part of a productive workflow.
Certainly covers a wider scope than any other VD manager. Looks up to date, tidy and simply beautiful. Can be easily configured and controlled. Runs stable and fast, thanks to structured (cough) implementation.
3. Virtual Dimension
Virtual Dimension: a free, fast, and feature-full virtual desktop manager for Windows platform. The main goal of this open-source project is indeed to enhance the Microsoft “Window Manager” up to the level of usual Unix Window Manager, by providing virtual desktops, as well as some additional features, like always on top, window shading…
4. Microsoft Virtual Desktop Manager
Manage up to four desktops from the Windows taskbar with this PowerToy.
5. Virtual Desktop
Virtual Desktop will create new desktops for you and let you to switch between desks and windows quick and easy. Virtual Desktop is built as a service and requires only 2MB ram memory to work. Virtual Desktop is freeware and comes with full Delphi sources.