As part of the development process for DotNetNuke, it has become a more stable, mainstream product and is in fact part of many installers on hosting companies, available from many Microsoft websites and popular on codeplex.
The focus XD Design will in relationship to information shared, is to allow those who are interested in managing their sites, an opportunity to learn more by providing case studies, examples, white papers that allow more insight on how this fantastic Web Content Framework is managed.
It is not like many other 'content management systems' and it is a shame it gets branded in this fashion. It's close ties with running on Windows Servers, along with a long standing relationship with Microsoft, give this product depth and substance that no other open source .NET based application can offer.