Disk Size Manager will help you to monitor the use of your resources.
3D ScreenSaver Jam
Free Lions Screensaver is a beautiful slideshow with images of lions.
Locate large files and folders that take up too much space.
Scan hard disks to analyze file & folder sizes and disk space distribution.
Simple tool that scans your PC to find the 50 largest files and folders.
Brian Brio Oraas
Folder Size for Windows shows sizes of folders seen in Explorer windows.
Compare the size of folders with one another.
SWMole Directory Size allows you to check Directory Size to find large folders.
Folder Size Tree displays all drives/folders/files size in a tree view.
Sub-folders and files can be specified to include or exclude from copy.
Luiz Marques - Starglider Systems
Print and visualize your folders. Find out where your HD space went! You can filter to include only....
Digital Information Gallery
It tells you about the actual size of your files and folders on hard disk.
NTFSRatio shows the size an compression rate of compressed NTFS folders.
Quickly displays the size of all folders and files in an Explorer-like window.