This is a great application.
http://virtuawin.sourceforge.net/
I have tried it installed.You can find the portable here.
http://www.pendriveapps.com/virtuawin-windows-virtual-desktop-manager/
I am afraid to install the portable version since i installed xampp from this site and got a Trojan horse.
This application was inspired by linux's virtual desktop. It helps you make multiple desktops in windows.