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Indeed I think that a lot of confusion stems from the multiple meanings of the term "service". Personally, I like to refer to the ArchiMate terminology that discerns business services, application services and infrastructure services; business services are defined independently of any IT support. Another distinction made in ArchiMate is external versus internal services. External services are exposed to the layer above, whilst internal services are exposed within the same layer (business, application, infrastructure). Services in ArchiMate are primarily aimed to be EA constructs; they show which behavior is exposed from a certain element. This does not automatically imply that it is a service from an integration perspective, and even if it does it's implementation does not have to be a Web Service. And even if the latter does; it does not necessarily map 1-1 onto a specific Web Service.
With respect to ESB; if you think of it as a concept then all application integration can be seen to use the "ESB", independent of whether integration middleware is used.
Regards,
Danny
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