XML Schema Designer CTP1
The Microsoft XML Tools team has released the first CTP of the XML Schema Designer - a graphical tool for working with XML Schemas. The XML Schema Designer is integrated with Microsoft Visual Studio 2008 and the XML Editor to enable you to work with XML Schema definition language (XSD) schemas.
The new features in the XML Schema Designer are not so much about designing schemas, but rather viewing or navigating large XML Schema sets that may consist of various physical xsd files and namespaces. The tool provides a aggregated, hierarchical view of the whole schema and the ability to find, sort and filter the elements and attributes.
If this is currently your challenge in life, go check it out!