Space

From andyh software:

Space - find where your space has gone. Hard drives are getting ever larger, yet after a while even the biggest drive starts to fill up with unwanted and forgotten files. It's tedious work looking through endless layers of directories to find those files that are filling up your drive. What you need is a way to see at a glance where all your space has gone. That's where Space comes in handy. Space is a Windows application that offers you several ways of displaying and quickly pointing out the most space-hungry of directories and files on your drives. And Space isn't limited to just hard drives. Network shares and FTP accounts can be scanned; particularly useful for checking remote fileservers, or your webspace usage. Space can also print displays of the disk usage, and export the collected information in CSV format for importing into other programs.