Microsoft has changed various aspects of what was called the Azure Services Platform. It's now known as the Windows Azure platform, and some pieces have been deleted, such as the Workflow part of .NET Services. For a current description, take a look at the updated version of David Chappell’s paper Introducing the Windows Azure Platform (formerly called Introducing the Azure Services Platform).
External source: http://www.davidchappell.com/blog/2009/09/updating-windows-azure-story.html