Several months after I wrote my first article on Mobile First (Nov 2009), Google CEO Eric Schmidt mentioned the importance of thinking about mobile first in his World Mobile Congress keynote. But since I couldn't track down a transcript of his talk, I was never sure if we were talking about the same philosophy.
Now in his presentation at the DLD conference, I've got definitive evidence that we're on the same page. Here's Eric explicitly outlining the mobile first doctrine!