TechEd is fast approaching and you should be sure to check out the preconference sessions that are available on Sunday, May 23rd. In particular, if you want to come up to speed on Web services you should check out Essential Web Services: Programming with .NET and WSE 2.0: Hands On Lab:
Instructor: Aaron Skonnard
The Microsoft .NET Framework makes it easy to build powerful Web services based on open industry standards, including XML Schema, SOAP, and WSDL. This workshop helps you quickly ramp up on programming Web services using ASP.NET's WebMethods (.asmx), then shows you how to extend this framework using the new Microsoft Web Services Enhancements (WSE) 2.0. Along the way, we cover several WS-* specifications supported by WSE 2.0 and show you how to take advantage of them in your code with a special focus on security.
If you haven't already signed up for TechEd, you should.