One topic teams transitioning into Agile Development struggle with is learning how the dynamic between the traditional development QA relationship changes.
Agile transformation involves more than just breaking development up into two week chunks and standing round for 15 minutes a day reporting progress. It actually involves a massive change in the way you develop software and in how the various roles now interact in a richer more integrated way. Development practice and interpersonal relationships change so that as a whole team you can deliver high quality business value consistently.
I found this article from TechWell brief but also informative on the topic of transitioning from traditional to Agile testing and is good for both developers and testers new to Agile development but also good as a refresher for experienced teams.
Transitioning from a Traditional Tester to an Agile Tester via @TechWell