A Scrum/Agile Infographic. A pictorial representation of Scrum and the things that happen inside each sprint. The Agile process promotes transparency, moves projects quickly and keeps marketers focused on a specific set of goals.
10 Tips for Successful Scrum Implementation - a nice visual on how agile development works. This is on particular method, but the foundation principles are the same. Stand out for me - listen to user stories to determine priorities.