During XP 2006 in Oulu, Finland. I attended a session jointly hosted by Amr Elssamadisy and Ahmed El shamy on patterns of Agile adoption.
There are now a few articles about that and other sessions that Amr has held in other conferences.
You can check the paper on “Functional Testing: A Pattern to Follow and the Smells to Avoid” (PDF warning) and the paper on “Adopting Agile Practices: An Incipient Pattern Language” (PDF warning).
These papers are very useful for those of us that need to deal with problems in the process towards Agile adoption.