There's a studio at Google where people can record videos. Compare an early video I did:
http://www.youtube.com/user/MattCutts?blend=5&ob=5#p/u/6... to more recent videos I've done like
http://www.youtube.com/watch?v=WJ6CtBmaIQM . The first video I did at home, while I believe the second video is from the same studio where they made the search quality video. The production values are much higher on the second video, even though the quality of the content itself is roughly the same.