You know the drill by now. What you see is what you type into google, but I’ve linked it here for ease of use.
This returns .xls files containing login names and passwords. It works by showing all the .xls files with password:(something). You will get some erroneous hits but you’ll notice that those aren’t relevant and, for the most part, aren’t spreadsheets. As always don’t use this for bad stuff. Karma has a habit of kicking you in the butt – plus you don’t know what you’re touching if you aren’t totally savvy – know what I mean?
If you’re really interested in this stuff you can buy the book “Google Hacking for Penetration Testers, Volume 2“. It contains a whole lot more about google hacking, and other equally scary stuff – I have it – it’s riveting!