Jonathan Rosenberg resigned from Google last week. He helped spell out a very coherent (some would say profound) expression of the open source ethos. It will be interesting to see who takes his place.
Equally important, though, is the idea of openness Rosenberg expressed to his fellows at Google. This short essay clearly defines the foundational ideas that underlie many of our beliefs as to why open source is good for companies and customers and why it will eventually win in any fair contest against closed systems.