MoreDesk

MoreDesk is a commercial product costing &pound;14.99+VAT. It does have more features than its free equivalents including


 * configurable number of desktops
 * different background images for each desktop
 * a scaled view of the entire grid
 * the ability to easily move windows between desktops
 * hotkeys to switch between windows
 * alerts for off-screen events
 * etc.

The MoreDesk documentation contains a discussion of other virtual desktop programs of which there are several. Most of the alternatives are older and/or non-32-bit compatible.