River of news

This post mentions Earthlink's new RSS news reader says "Until yesterday these were the only aggregators that worked this way." Well, that too is not quite correct. Drupal has for at least a few years included an aggregrator that works in the River of News format. Granted that Drupal's aggregrator doesn't have some of the other features for easily marking posts as read, but it's been doing river of news for a long time.