I spent a few hours of my weekend attempting to research and define these concepts a bit better, in essence, taking everyone's opinions and normalizing them so they make better sense. What I found were many of the same notions, defined differently, but all attempting to solve the same problems. Seems to be a common theme within the world of SOA, but I digress.

Indeed, there are many definitions for the above concepts (not those terms specifically) that are now being defined by guys like me, standards organizations such as OASIS and the Open Group, and vendors such as IBM, BEA, WebMethods, and TIBCO. Sometimes they align; most of the time they don't.