Just to recap. What are Web Services? They are Encapsulated, Loosely Coupled, Contracted Software Functions, Offered Via Standard Protocols. This means the implementation of the function is never seen from the outside. They are loosely coupled: A change in the implementation of one function does not require change to the invoking function. There are publicly available descriptions of the function, its behaviour, input/output parameters (WSDL) and how to bind to it. Standard protocols are open, widely published and freely available for anyone to implement.
Due to the simplicity & interoperability of web services, new business and revenue models will emerge because it's no longer necessary to have the same runtime environment to do business. This will give rise to New Service Organisations or Brokers that;
1. Syndicate & Aggregate Web Services
2. Provide management of Web Services, quality of service ratings, SLA's, payment and distribution
3. Publish and describe legacy (corporate) functions (create invoice, open an account, book flight)
4. Enable between transactions between parties that are previsouly unknown to each other
TypePad & Google are creating horizontal stacks of services or widgets. Are they service brokers now? When will they engineer industry specific marketplaces e.g. Pharma, Telecoms, Retail? What will be their business model?