Spaces is one of the many things that makes Leopard so much better than using Windows. The ability to work on 4 different desktops at once is like having 4 different monitors.
It has to be said though it can be a little confusing when switching regularly between different spaces and there aren't many customization options. Hyperspaces is designed to solve this problem by creating a far more intuitive Spaces experience. Among its many benefits, Hyperspaces allows you to set different wallpapers on different desktops, give names to your desktops (excellent for dividing work and leisure) and create keyboard shortcuts to spaces.
Hyperspaces instantly integrates with Spaces so you're ready to go as soon as you've unpacked it. You'll need to click on your spaces icon in your menu bar to start configuring the various options available to you. I added two new labels - Work and Leisure - and tried to apply a new desktop picture to the leisure space. However, the desktop background would not appear, although if you right click on the spaces icon it shows you a thumbnail of each space where it did appear for some strange reason. I then changed the images to one of a smaller resolution and it worked fine, so be aware that trying to use backgrounds of a very high resolution may not work properly.
Hyperspaces is an excellent extension to Spaces and great for those that often get confused switching between spaces or want multiple desktop backgrounds.