The script is linked to in a zipfile at the bottom of the article. It's under the "Resources" heading and it's called DiskSpaceStats.zip.

FYI, I wrote a part 2 to this article on my blog at http://shaunjstuart.com/archive/2010/10/im-published/[/url] which details how I used the data this collects to make a SSRS report.

Shaun