I watched this over lunch and found it really interesting. Particularly:
* History of the retail site, early architecture. Originally ran on DEC hardware.
* How the retail side began to adopt AWS services for internal projects, non-critical features.
* Some details about their continuous deployment infrastructure (Apollo). "How would you manage deployment if you had infinite capacity?" New versions are stood up on clusters of new instances; the old instances are kept around for a while to allow for fast rollback.
* As of November 2010, all front-end webservers run on EC2.
* Scaling costs:
"The cumulative amount of data stored predicts long-term hardware
spend more accurately than transactions per second"