"del.icio.us direc.tor is a prototype for an alternative web-based rich UI for del.icio.us. It leverages the XML and XSL services of modern browsers to deliver a responsive interface for managing user accounts with a large number of records."
Timeline is a DHTML-based AJAXy widget for visualizing time-based events. It is like Google Maps for time-based information you can populate Timeline with data by pointing it to an XML file