The Agile FAQ has provided some information on what team working agreements and ground rules are in this article.

Steve Freeman provides this article on how playing music relates to programming.

Kent Beck discusses the use of abstractions versus concrete parameters and why each is usable given the right context in this article.

Dean Wampler discusses a couple of good principles for dealing with configuration management on a large scale including use of commercial and open source management tools in this article.

Uncle Bob Martin produced these principles that help many people grasp object-oriented design deeply.

A catalog of common issues individuals and teams run into while doing TDD on their projects is well under way in this blog entry.

Lisa Crispin provides a couple of good stories about her experience on teams and the ratio of testers to developers in this blog entry.

Mark Levison captures some good references from thought leaders in the Agile community on what constitutes a good test in this blog entry.

The Microsoft Patterns & Practices group had put together a suggested process for implementing architecture while keeping an Agile method of software development in this article.

The use of exploratory testing along with unit-level test-driven development is asserted as potentially more valuable than automated acceptance testing in this article from Brian Marick.