The article covers the diagram feature well. I got an email with the subject line "Database Modeling and Diagrams with SQL Server 2008". It led me to think this article will talk about new features in SQL Server 2008. Most of the features covered in the article were already there in earlier versions. This article does not clearly indicate which features are propriety to SQL 2008 only.

I missed Steve's comment...

"Not everyone has been using SQL Server for more than one version. We get new people all the time and publish articles to help all levels of users."

In light of that, I think it was fair for the author to title it as he thought was proper.