Getting Started with XML
Learning XML Overview
Which XML API should I use (System.XML, LINQ to XML, or MSXML)? What tools are available in Visual Studio? Plus links to many articles.
Integrating XML into Applications
Extensive guidance for working with MSXML, XML and the database, schemas, stylesheets, and more.
XML Tools
Using Visual Studio's integrated XML editor, schema expolorer and XSLT debugger.
System.XML
System.Xml is the set of managed .NET classes for processing XML according to standards.
MSXML
Microsoft XML Core Services (MSXML) is the native API for building high-performance XML-based applications that adhere to XML 1.0.
XSLT
The Extensible Stylesheet Language Transformation (XSLT) lets you transform the content of a source XML document into another document that is different in format or structure.
XML Namespaces
All about namespaces in an XML document.