Christopher Koch writes an interesting article about SOA and BPM, and I think I will weigh in on this debate.
The Koch Article
In short it is about the disconnect between IT and the commercial side of a business. It argues that in workflow/BPM business has found its champion to bridge the business/IT divide while IT wants to use SOA to fill the gap.
Well there are a few comments I would like to make on this article.
First BPM is a Service Oriented Architecture in a sense. It is just that it is not as open and available as most SOA. BPM/workflow products can act as services and they are part of architecture.
Second (and let me point out I am in IT and geek blood pumps through me veins) is to never let IT be the guide. IT will create the most amazing technically challenging things that will be of not value to the business.
To read the referenced article in its entirety (and it is a interesting way to spend a couple of minutes) visit.