KDirStat is a graphical disk usage utility similar to the du command with some additional cleanup features. Most of the Linux distributions have this software included in their software repositories. If it is not installed by default, you can install it using the package manager of your dlistribution.

After launching it, you will be asked for the directory that you want to scan for disk usage. I have scanned the entire root filesystem (I) and the output is shown in Figure 1. The output contains the directories in a sub-tree structure, usage in both graphical and numerical form, the number of files and sub-directories, and the latest modified time within an entire directory tree.

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KDirStat scans the directories on your mounted file system and also scans the FTP or Samba directories. It provides same predefined cleanup actions like compressing it to a tar.bz2 archive, deleting a file or a directory, or opening the directory in a terminal or in Konqueror. You can edit the clean-up actions or define your own set of actions. These settings are shown in Figure 2. If you are a systems administrator, you can even send an e-mail to the owner of the directory that's consuming a lot of space, notifying him to clean up the unused files. The option is available under the Report menu.

I'd recommend you play around with this software to understand its various features and functionalities.