WSE Unearthed

In an amazingly simplified series of articles about WSE, Scott Mitchell outlines the different enhancements that have been bundled with WSE..A must read I think(courtesy 4guysfromRolla):

Part 1 - Examines the basics of Web services, what Web services are, and the technologies and standards that serve as the underpinnings of Web services. (October 8th, 2003)
Part 2 - Examines creating Web services using Visual Studio .NET. Looks underneath the hood of the code created by VS.NET. (October 15th, 2003)
Part 3 - Examines creating a client application that consumes a Web service. Discusses the purpose and structure of a WSDL document, along with creating and using proxy classes to consume a Web service. (November 5th, 2003)
Part 4 - Examines the utility of Web services and common scenarios where Web services make sense. A business-oriented look at Web services. (November 19th, 2003)
Part 5 - Takes an in-depth look at XML serialization, which is the process of converting a data type, such as an integer, array, or custom class, into its XML representation, and back again. Every time a message is passed to or from a Web service, XML serialization transpires. (December 17th, 2003)
Part 6 - Looks at sending metadata to a Web method through the use of SOAP headers. Examines defining and accepting a SOAP header on the Web service end, and looks at sending a populated SOAP header from the client. (December 31st, 2003)
Part 7 - Examines how the incoming and outgoing messages to a Web service can be programmatically modified via SOAP Extensions. (January 21st, 2004)
Part 8 - Learn about the Web Service Enhancements (WSE) and Microsoft's free class library for implementing the WSE standards. (June 30th, 2004)
Part 9 - See how to implement UsernameToken authentication using the WSE 2.0 Toolkit. (July 14, 2004)
Part 10 - Learn how to send large amounts of data as attachments using DIME and WS-Attachments. (September 8th, 2004)