I presented this latest iteration of The Why of Scrum at a recent BayALN meeting in San Francisco. It builds on the Dogma-free Scrum presentation given in London in October 2011, and complements the recent Agile Anarchy post The Soul of Scrum.
You can see the full-size pdf on Google Docs, here. Feel free to download the document, but if you want to share this presentation in any way please contact me. Thanks.