Thomas Erl's SOASpecs.com
- A reference Web site dedicated to WS-* specifications, first generation Web Services specifications, and core XML specifications.
- http://www.soaspecs.com/

Web Services Specifications
- A collection of links to specifications for Web Services at the MSDN.
- http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnsrvspec/html/wsspecsover.asp?frame=true