In the current JavaSpektrum magazine an article about the two different (actually opposite) approaches:
"Service Oriented Architectures vs. Domain Driven Design with EJB 3.X" was published. The magazine will hit the shelfs at 18.01.2008, however the article is already available as a PDF for download.
I will discuss some topics from this article during the sessions "Enterprise Architectures in Practice" and partially in the "Greenfire" at the next OOP-conference in munich as well - so feel free to come for a chat during the conference.
Your feedback (as always) is highly appreciated! Leave a comment, or send me an email.