My January 2010 DDJ Agile Update, Tragic Mistakes When Adopting Test Driven Development (TDD) , is now online.  In the article I summarize what I consider to be common, and tragic, mistakes that I'm
seeing organizations make when they attempt to adopt TDD.

These mistakes
include:

• Not providing sufficient training, education, and
  mentoring
• Not supporting pair programming
• Not reducing the creation of
  non-executable detailed speculations early in the project
• Not reducing the confirmatory testing being done by
  their independent QA/testing team
• Completely reducing initial requirements envisioning and architecture envisioning
• Completely reducing parallel independent testing

The
article also goes into potential benefits of TDD as well as
potential challenges that you're face when adopting it.