Update: Here's Andy Rubin's farewell letter to Android partners. (via The Verge)
In November of 2007 we announced the Open Handset Alliance with 34 founding members. Today, I'm grateful to the over 85 OHA members who have helped us build Android and drive innovation at such an incredible pace. The Android ecosystem has seen tremendous growth since the launch of the very first Android device in October 2008. The volume and variety of Android devices exceeds even my most optimistic expectations - over 750 million compatible devices and counting!
At its core, Android has always been about openness - the idea that a thousand brains are better than one.