Directory Disk Usage

Diruse.exe: Directory Disk Usage: "This command-line tool displays directory size information, including compression information for NTFS volumes. You can use Diruse to determine the actual usage of space for compressed files and directories. You can also specify a maximum folder size. Diruse then marks any folders that exceed the specified limit and, if you choose, alerts you to the problem. Diruse is similar to du used in UNIX."

This tool, although small, is a great addition to any administrator's toolkit. I recently was able to use it in a way that solved a very large and time consuming monitoring issue that I had.