i think streams for image based sites, so long as the taxonomy is correct could be a killer UI. Thats one of the reasons Pinterest is moving along nicely.

Streams allow people to find/stumble across information they may not have known existed. A visitor could enter (site) with a permalink to the content and then find a zillion spinoff conversations/articles - rather than forcing them to search or use poor navigation by the site owners, they could now spin themselves around the web based on streams of content... Love the idea!