Inside the iPhoto 5 application there is a 'DesignPrototype.plist' file for every theme, specifying the pages and their layouts for that theme. This is a very bad discovery for my productivity. Especially since if I want to hack it effectively I'm going to need to create a custom tool to help me with the page layout... It's human readable, but editing a tree of x-y locations and sizes is... But then I guess that's what graph paper is for. Fun! Time sink! Gah!