VS 2008: The MIA Features: Figure 2: Edit XML Schemas.
Visual Studio 2005 and earlier versions have a graphical XML schema window that was intended to support schemas for typed and untyped Recordsets, but not much else. The Visual Studio team dropped the graphical XSD editor from VS 2008 but didn't have a replacement ready at RTM-time. The new text-based XML Schema Editor, shown here in its August 2007 CTP implementation, handles multiple schemas and provides an XML Schema Explorer pane that gives you a tree view of the active schema, as well as lets you search for matching elements or attributes. Future CTPs will have an optional graphical editor that follows the XML document structure.