The most interesting feature with Fences is that, if you choose to have a clean vew of the desktop, simply double-click on the desktop and all the fences disappear and when you need them simply double-click again and you have your icons / fences back on the desktop. This can come handy, if your desktop is cluttered with icons or even fences. Also, gives a pleasant view of the desktop if you have custom desktop backgrounds.
Other features include SmartFences, snapshots, skinning, automatic scaling (for screen size changes) etc. Fences is free for personal use and can be downloaded here. Fences works on Windows Vista & Windows XP (need to check this on Windows 7)