The WebserviceX.NET Data Protocol is a SOAP-inspired technology for reading, writing, and modifying information on the web. Tools to help you develop your app and grow it into a business.

This site offers many services (for free i think) in many areas:

• Business and Commerce
• Standards and Lookup Data
• Graphics and Multimedia
• Utilities
• Messaging
• Value Manipulation / Unit Converter
• Other Web Services

Service Oriented Architecture, Web Services, XML, SOAP, WSDL, UDDI, loosely coupled, service oriented, web services, SOA, web service security, WS Security, web service process, web service practices, Component Based Development, Software component, component software, software reuse, Web Services Provider, enterprise application integration.

There is also this UUL WebserviceX.NET :: XML Web Services solution provider which could be a slightly older version of the site.