Carsten and I just returned from a Web Developer Meeting of the .NET Developers Association. For us, building forty is just a block away, so we decided to sit in on Michael Stiefel's talk on SOA. You can download the presentation and source code here.
Michael (who still remembered me from a book publishing summit waaay back) recommended that we (as in all attendees) check out the Metropolis Webcasts: Pat Helland relates the evolution of technology architectures to the evolution of city planning and shows us how far we have yet to go.
The Microsoft Architect Journal also has an article on Metropolis.