Ari Paparo Dot Com: Getting it Right: "Mistake: Folders Suck
Our first iteration on using bookmarks to create a shared information library was an extension of the 'public folder' concept. We believed that users would not only make their folders public, but also would categorize those folders into a directory structure. We called this the 'Public Library' and created a Yahoo-like node structure on which users could post. This could have made sense since categorizing folders would be less work than categorizing individual bookmarks – after all, the folders were already 'categories' of a sort."