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The 187 best plugins
A jQuery HTML Content Slider with horizontal, vertical and fade transitions, display and move multiple slides at once (carousel), prev / next, pager, auto controls, easing transitions, random start, ticker mode, optional styling included. Before, after, first, last, next, prev callback functions. Has tons of options.
A jQuery plugin that provides a full-sized, drag & drop calendar. Fetches events on-the-fly for each month and is easily configured to use your own feed format. An extension is also provided for Google Calendar. It is customizable and exposes hooks for user-triggered events (like clicking or dragging an event).
jQuery Form Plugin
Easily and unobtrusively upgrade HTML forms to use AJAX. The main methods, ajaxForm and ajaxSubmit, gather information from the form element to determine how to manage the submit process. Both of these methods support numerous options which allows you to have full control over how the data is submitted.