Agile Project Management with Scrum

Agile Project Management with Scrum by Ken Schwaber, one of the co-creaters of Scrum, is a quick read about the system to manage software development. The book covers the basics of Scrum, and provides plenty of case studies. Unfortunately, it's a few years old so there aren't any examples of Scrum being used at a SaaS company. Those looking for a high-level overview of Scrum on the cheap can download Ken Schwaber's free Scrum Guide from the Scrum Alliance.