The details=1 query string is added when you click "Edit" in your own photostream's header. Funnily enough, at the moment the details=1 layout even preserves t

The details=1 query string is added when you click "Edit" in your own photostream's header. Funnily enough, at the moment the details=1 layout even preserves the old "Did you know you can change the layout of this page?" link at the bottom, linking to a 404.