Sometimes these little slideshows that show up in my email turn me onto some useful piece of software I was previously unaware of, but this one sets the bar pretty low.
Nine slides, sparsely describing seven GNU/Linux distributions plus Apple's Snow Leopard. Realistically, who's the audience for this? What subset of their subscribers isn't aware that other operating systems exist, and have characteristics different from Windows 7?
This is even worse than 10 Must-Have Applications on Windows 7 Launch Day, a list that included iTunes and Office 2007. And AVG Antivirus.
Walking Through 50 Years of Hard Disk Drive History? That was actually worth reading.