Flickr is a famous photo gallery website, it's almost built on free
software too, this article shows the architecture of Flickr.

http://highscalability.com/flickr-architecture



-- 
Bill Xu
Founder, ZEUUX Project      | bill at billxu.com
Free Software, Free Society | +86 139 1051 1732
http://www.zeuux.org        | http://www.billxu.com