Unlike most virtual desktop managers, Finestra Virtual Desktops is elegant and easy to use. Using Vista's new thumbnail window previews, Finestra can give you a full screen preview of all of your desktops. If you still have XP, Finestra gives you the same fullscreen preview with static thumbnails.
Finestra Virtual Desktops also contains many useful features such as per-desktop backgrounds, window menus, sticky windows, a mini-preview when you hover over the tray icon, and numerous configurable keyboard hotkeys. You can have as many virtual desktops as you want and they will all neatly arrange themselves in the switcher and in the mini-preview.