FullCalendar - jQuery plugin to provide a calendar interface
Link posted on November 18, 2009.
URL: http://arshaw.com/fullcalendar/
Thanks to Jacob for finding this one.
"FullCalendar is a jQuery plugin that provides a full-sized, drag & drop calendar ... It uses AJAX to fetch events on-the-fly for each month and is easily configured to use your own feed format (an extension is provided for Google Calendar). It is visually customizable and exposes hooks for user-triggered events (like clicking or dragging an event)."
This is just fantastic. I don't have a particular need for it at the moment, but it's very comforting to know that it's there when I do.