The Inflection Point System which offers insights in choosing alternatives in Agile environments.
Trim Tabs which offers insights in the power of using small leverage points for big gains.
Here is a list of various books, classes and support materials which might help you in preparing for a facilitated session. This list is by no means comprehensive, but it should give you a start.
Bens, Ingrid M, and Janet MacCausland. Facilitation at a Glance! A Pocket Guide of Tools and Techniques for Effective Meeting Facilitation. Boston, MA: Goalqpc, 2012.
Cameron, Esther. Facilitation Made Easy: Practical Tips to Improve Meetings & Workshops. 2nd. London: Kogan Page, 2001.
Farrell, John D, and Richard G Weaver. Practical Guide to Facilitation: A Self-Study Resource. Amherst, MA: HRD Press, 2000.
Gottlieb, Marvin R. Managing Group Process. Santa Barbara, CA: Praeger Publishers, 2003.
Hogan, Christine. Understanding Facilitation: Theory & Principles. London, UK: Kogan Page, 2002.
Straus, David. How to Make Collaboration Work: Powerful Ways to Build Consensus, Solve Problems, and Make Decisions. San Francisco, CO: Berrett-Koehler Publishers, 2002.
Rostron, Sunny Stout. Accelerating Performance: Powerful Net Techniques to Develop People. London, UK: Kogan Page, 2002.
Lucas, Robert W. The Creative Training Idea Book: Inspired Tips and Techniques for Engaging and Effective Learning. New York, NY: AMACOM, 2003.
Maurya, Ash. Running Lean: Iterate from Plan A to a Plan That Works. O’Reilly Media, Inc., 2012.
Warner, Jon and Paul Wildman. The Problem-Solving & Decision-Making Toolkit: 32 Fully Reproducible, Ready-to-Use Tools to Help You Build Your Know-How to Solve Problems, Be More Creative, and Make Better Decisions. HRD Press, 2003.
Marquardt, Michael J., and Lisa Horvath Davies. Global Teams: How Top Multinationals Span Boundaries and Cultures with High-Speed Teamwork. Boston, MA: Nicholas Brealey America, 2012.
Paulenn, David. Virtual Teams: Projects, Protocols, and Processes. Hershey, PA: Idea Group Publishing, 2003.