If you copy xsd-files to C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\Packages\schemas\xml (or wherever VS.NET is installed), you will get intellisense and validation in the VS.NET XML editor when editing XML files. In Visual Studio 2005 the directory is C:\Program Files\Microsoft Visual Studio 8\Xml\Schemas.
Technobabble from a .Net developer on the loose…
