These lists will now be maintaned in the Web Services and WS Extensions discussion forum.

Basic Web Service Specifications

• W3C SOAP Specs: 1.1 | 1.2 Part 1 - Messaging | 1.2 Part 2 - Adjuncts
• SOAP 1.2 Usage Scenarios
• W3C - Web Services Activity
• Microsoft resource pages: SOAP | WSDL | UDDI
• See also the Web Service Extension Summary on this web site

General

• SOAP vs Corba (Pro Corba)
• Soapbox: Magic bullet or dud? (Pro SOAP)
• ASP.NET Web Services or .NET Remoting: How to Choose
• Performance Comparison: .NET Remoting vs. ASP.NET Web Services
• Doculabs Performance comparison of J2EE & .NET Web Service platforms (PDF)
• Web Services Security
• Fawcette Magazines - 140+ articles on Web Services

Available Web Services

• XMethods - Index of free and subscription based Web Services

Developer Resources

• XML Services Group- Web Services
• .NET Web Service Tools (Also useful for non-.NET developers)
• Web Services Newsgroup (MS News Server)

Interoperability

• XML Web Services Interoperability Resources
• Web Services Interoperability Organisation
• SOAP Interoperability
• Fail-Safe Interop for Your Enterprise - Web Services Interoperability.
• Integrate .NET and J2EE With Web Services
• Web Services GXA Interoperability (MS News Server)

Document/Literal vs RPC/encoding

• WS-I Draft Disallows rpc/encoded Format
• Rpc and document SOAP from one .NET web service
• MSDN: Customising SOAP Messages

Workflow & Web Services

• Business Process Execution Language for Web Services (BPEL4WS), Version 1.1
• Web Service Choreography Interface (WSCI) 1.0
• Understanding BPEL4WS (IBM Developer series): Part 1 , Part 2 , Part 3, Part 4, Part 5, Part 6
• BPEL - Learning Guide
• Pattern based analysis of BPEL4WS (PDF)
• ebPML Review of BPEL4WS 1.0 (Includes useful UML models)

Web Service Security

• Understanding WS-Security
• Security in a Web Services World: A Proposed Architecture and Roadmap - A joint IBM / Microsoft Whitepaper
• WS-Security Roadmap
• Compare Web Service Security Metrics
• Do WS-Security's granular X.509 digital signatures/encryption justify certificate management and performance problems?

Online Magazines / Forums

• WebServices.Org
• MSDN Magazine - Web services topic