A small tutorial on SOAP
SOAP is a simple and open standard XML-based protocol for exchanging information between computers. In this tutorial you will learn what is SOAP and Why and How to use it. SOAP is very easy to learn and to use and in demand too.

Herong's Tutorial Notes on Web Service and SOAP
This free book is an excellent tutorial book for beginners. It is a collection of notes and sample codes written by the author while he was learning PHP himself. Topics include ActivePerl, Axis, Binding, Data Model, Encoding, HTTP, Java, Message, Message Exchange Patterns, NuSOAP, online, PEAR, PHP, Properties, RPC, SOA, SOAP 1.2, SOAP Extension, SOAP::Lite, UDDI, Web Method, Web service, WSDL

SOAP PHP Implementations
PHP Implementations of SOAP. Checking My PHP Installation on Windows. Installing SOAP Library on Windows.

Using SOAP in PHP
Learn how to create simple XML-RPC/SOAP web services using PHP and nuSOAP.

BizTalk
In this tutorial, we will look at BizTalk Framework 2.0, which is an extension of the SOAP specification. BizTalk Framework 2.0 provides a structure for building solutions that move data contained in a SOAP document across boundaries.

SOAP (Simple Object Access Protocol)
Simple Object Access Protocol (SOAP) is an industry standard designed to improve cross-platform interoperability using the Web and XML.

SOAP Java Implementations
Java Implementations of SOAP. Axis Installation Requirements on Windows. Installing Axis 1.2.1 on Windows. Installing JAF 1.0.2.