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There is an interesting war being fought in the blogosphere over the use (or overuse) of ESB (enterprise service buses) to build out a SOA (service oriented architecture). But everyone is talking in abstractions, and no one's really giving anyone a good idea of when to use an ESB or when to avoid them. No one seems to be looking at why people are or aren't using ESBs and getting to the root of the question - when are they appropriate for use in a SOA and when are they simply being implemented for the sake of being implemented?