It's unclear as to just how long this offer is valid for but O&O are currently offering the latest full version of their DiskStat Professional Edition (normally $44.95aud) for free.

[i:2eh86x1g]O&O DiskStat is a high-power tool for analyzing the used disk space on your storage volumes. With an easy-to-use interface based on the design of the Windows Explorer, you can take a closer look at the file and folder structure of your internal and external drives. Through intuitive and beautiful graphical representations you will find out which files, file types and folders are taking up the most space.

Important Features at a Glance

IMPROVED: Graphic display in the user interface
Quick Analysis of the File System Structure
Supports All Internal and External Drives
Intuitive and Appealing Representation of File and Folder Structure
Windows Explorer Look & Feel
Easily Find Files Occupying the Most Disk Space
Full Support of 64-bit Systems
Full Microsoft Windows Vista Compatibility[/i:2eh86x1g]

Registration Page here: http://www.oo-software.com/home/en/spec ... ?id=h0298e
Home page , including download link, here: http://www.oo-software.com/home/en/prod ... index.html