Last night, I attended Zach's address at Google. He broke down the RepRap madness for around 50 people, and he did an impressive job. He started from scratch and made this entire enterprise easy to follow. He handled the difficult questions with honest assessments of the challenges, and he disarmed the hostile questions with simple grace. He inspired a bunch of people to think about replication and home fabrication in ways they've never considered before.
Good job, Zach.