This is an extremely useful software not to mention free software, that allows you to instantly see a snapshot of your file system and figure out which folders are taking the most space.

By default Windows XP doesn't allow you to see Size Details on each filder in the same way it gives you the information on any individual file.

Once you install Folder Size application, you'll be able to add a set of new columns that display Folder Info just as easy as you can see File Info.

Having this feature will help you sort and eliminate any folders that contain for example temp files, or some useless files that you didn't even realize you had.

Visit http://foldersize.sourceforge.net/ to download and read developers comments about the software.