The following articles by Scott Ambler appear on either the the Agile Modeling or Agile Data web sites. A lot of that material is relevant, but I've picked out a few articles which are most relevant to the Agile Architect:

• An Introduction to Agile Modeling and Agile Documentation
• Architecture and Architectural Modeling Techniques 
• Agile Architectural Modeling
• Agile Enterprise Architecture
• Agile Enterprise Architecture: Beyond Enterprise Data Models 
• Adopting Agile Database Techniques
• Becoming Agile
• Easing into Agile Modeling
• Evolutionary Development
• Active Stakeholder Participation  
• Agile Documentation  
• Generalizing Specialists
• Model Reviews: Best Practice or Process Smell?
• The Object Primer -- An Introduction to Techniques for Agile Modeling
• The Object-Relational Impedance Mismatch