Given the dominance of Hierarchical folders over the last 40 years, this is a major development in the history of information management. Implicit in Google’s product offerings is an declaration of war: Hierarchy is doomed, and Search is going to kill it. —John Hiler —Google’s War on Hierarchy, and the Death of Hierarchical Folders (Microcontent News)

The article doesn’t deliver as much philosophical speculation as the blurb suggests… it’s actually a historical retrospective, rather than a set of musings about the future. But it’s still a good retrospective.