Dion Hinchcliffe provides an update on the Ajax story:
Ajax has been the other big software story of 2005, along with Web 2.0. An optional ingredient to Web 2.0 software, Ajax has changed the perception of Web-based software as being horribly clunky, page-oriented, and boring when compared to native computer applications. Ajax describes a set of techniques that makes Web software quite the opposite. A quick visit to Google Maps and its live scrollable map tiles or NetVibes and its drag-and-drop reorganization of your personal data both show how potent and compelling Ajax techniques really are.