A Busy Developer's Guide to SOAP
Describes a subset of SOAP 1.1 that forms a basis for easy interoperation between different environments.
Gentle Introduction To SOAP
This document provides an introduction to the SOAP protocol. Only a basic knowledge of what a procedure call is and some familiarity with XML is required.
Real SOAP Security
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dn_voices_webservice/html/service11
Article by Matt Powell on MSDN. Despite the fact that SOAP as we know it today has no real support for security, there are secure XML Web Services in existence today.
SOAP FAQ
Frequently asked questions on SOAP. By Vivek Chopra, SOAPRPC.com.
SOAP: Frequently Asked Questions
Simple Object Access Protocol is a way to use the existing Internet infrastructure to enable applications to communicate directly with each other without being unintentionally blocked by firewalls. By Microsoft.
Using WSDL in SOAP Applications
Provides an overview of WSDL, history and background of various related technologies such as SOAP, and UDDI. By Uche Ogbuji, Fourthought, Inc.
Web Services and the Simple Object Access Protocol
The Simple Object Access Protocol (SOAP) improves Internet interoperability with an XML-based, platform-agnostic approach to programming the Web. By Pete Loshin, Microsoft.