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Update: Flickr hits 2 Billion photos served. That's a lot of hamburgers.
Flickr is both my favorite bird and the web's leading photo sharing site. Flickr has an amazing challenge, they must handle a vast sea of ever expanding new content, ever increasing legions of users, and a constant stream of new features, all while providing excellent performance. How do they do it?
Site: http://www.flickr.com
Information Sources
Flickr and PHP (an early document)
Capacity Planning for LAMP
Federation at Flickr: Doing Billions of Queries a Day by Dathan Pattishall.
Building Scalable Web Sites by Cal Henderson from Flickr.
Database War Stories #3: Flickr by Tim O'Reilly
Cal Henderson's Talks. A lot of useful PowerPoint presentations.
Platform