Many people use SpaceMonger for cleaning up their disks, so in addition to providing many ways to analyze your data, SpaceMonger also provides tools to help you clean it up.
(Note: SpaceMonger 2.1 is not designed to replace the Windows Explorer. It provides tools for quickly cleaning up a very messy or very overloaded disk, but if you want to just generally rearrange your files and folders, the Windows Explorer tends to be a little better at it.)
On the next page, we'll cover a few of the basics, and then you can start playing on your own.