Thanks to a tip on Channel 9, I've found out about the Microsoft Architecture Journal. Note that to download the PDF you must register, but the articles also show up online.

As an example, the first issue contains:

  • Best Practices for Rule-Based Application Development
  • Business Process Decomposition and Service Identification Using Communication Patterns
  • DasBlog: Notes from Building a Distributed .NET Collaboration System
  • Enterprise Architecture Design and the Integrated Architecture Framework
  • Metadata-Driven Application Design and Development
  • Understanding Service-Oriented Architecture
  • Check it out!