Web Services Explained
 Comparisons of web services from Microsoft .NET and Java points of view.
ASP.NET Web Service
 Downloadable tutorial and source included.
W3Schools .NET Web Services
 Includes an XML tutorial, SOAP tutorial, and WSDL tutorial.
C# Web Services
 Link at bottom to download the entire tutorial with source code.
Web Services Primer
Learn how and why to use a web service in your architecture.
4GuysFromRolla Creating a Web Service
Two part tutorial with simple code samples in Visual Basic .NET.
Creating and Consuming .NET Web Services in Five Easy Steps
Great .NET web services tutorial with samples in C# and VB.NET!
Creating Web Services with .Net and Visual Studio
Topics include web services 101, WSDL, creating a web service, testing a web service, debugging, web references, and more.
Building XML Web Services Using C# and ASP.NET
This tutorial will explain what a web service is and lead you through creating some sample web services.
Creating a .NET Web Service
Great tutorial on how to develop and test web service using C#. 
Build Your First Web Service With Visual Studio .NET
Nice little single page tutorial on how to create a web service with Visual Studio .NET and VB.NET.
Test-Drive Microsoft's WSDK (Web Services Development Kit)
Eight part tutorial/article going into great detail on what to expect and how to use Microsoft's WSDK. Samples are in VB.NET.
SoapRPC.com Tutorials
Tutorials on SOAP, web services, XML-RPC to SOAP, and much more.
Developer.com Web Services
 Topics such as WSDL essentials, web services security, UDDI, and a web services glossary.
Java/C++ Web Services
Several tutorials to guide you through creating and deploying web services using both Java and C++.
Web Service Tutorial in C#
Nice single page tutorial with sample code demonstrating how to create and consume a C# web service using Visual Studio.NET.
Web Services Tutorial: Understanding XML and XML Schema
Two part tutorial covering the basics of web services, what makes a web service, and the XML standard forming the underlying layer in web services.

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