Dexpot allows you to create multiple, virtual desktops to increase the work area of your screen by up to 20 times. Each virtual desktop is independent from the others and can have its individual wallpaper, resolution, and icons (or no icons at all). You can easily switch between desktops from the tray icon, or via hotkey, or even use an automatic desktop slideshow that rotates all virtual desktops. In addition, you can move and copy windows from one desktop to another among the desktops, set up rules to automatically move, copy or close windows and more. Dexpot is one of the most advanced desktop managers out there, that is easy enough for beginners, but offers some great flexibility for more demanding users as well.
Despite its sophistication, Dexpot is using only 2 MB RAM.
Dexpot is freeware, suitable for Windows 2000/XP/2003/Vista/2008/7 (incl. x64) portable versions are available too.