RequestFullScreen is a very cool new feature that is supported by Gecko and Webkit based browsers. So the idea is that you can put any element in a full-screen mode. Of course the feature can not be called automatically, because of security reasons.

View Plugin: http://raikov.org/blog/html5-fullscreen/

FullCalendar is a jQuery plugin that provides a full-sized, drag & drop calendar like the one below. 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).

View Plug in Site: http://arshaw.com/fullcalendar/

jQuery.dotdotdot is an advanced cross-browser ellipsis for multiple line content plugin.

View Plug in Site: http://dotdotdot.frebsite.nl/

BACKSTRETCH
a simple jQuery plugin that allows you to add a dynamically-resized background image to any page

View Plugin: http://srobbin.com/jquery-plugins/backstretch/

jPlayer is the completely free and open source (GPL/MIT) media library written in JavaScript. A jQuery plugin, jPlayer allows you to rapidly weave cross platform audio and video into your web pages. jPlayer’s comprehensive API allows you to create innovative media solutions while support and encouragement is provided by jPlayer’s active and growing community.

View plugin Site: http://jplayer.org/

What is TopUp?

TopUp is an easy to use Javascript library for unobtrusively displaying images and webpages in a Web 2.0 approach of popups. The library is jQuery and jQuery UI driven in order to maintain cross-browser compatibility and compactness.

View Plugin site: http://gettopup.com/

Tipped allows you to easily create beautiful tooltips using the jQuery Javascript library.

Evolved from the popular Prototip library, Tipped takes tooltips to the next level by using HTML5 to give you full control over the look and feel of your tooltips.

Visit Plugin: http://projects.nickstakenburg.com/tipped

A jQuery plugin to add balloon tips to elements User-friendly, fine-tunable and without css and images.

Visit Plugin: http://file.urin.take-uma.net/jquery.balloon.js-Demo.html

There are those points in every interactive designer’s career when he becomes fed up with producing the same set of graphics all over again for every website he designs. It could be the social network icons, gallery arrows or any number of his «signature» butterflies for the footer of each of his projects. Similar for interactive developers that have to slice the same GIFs and PNGs each time art-director asks them to.

View WebFont Site for Download: http://www.justbenicestudio.com/studio/websymbols/

Rotate3Di is a jQuery Effect Plugin that makes it possible to do an isometric 3D flip or 3D rotation of any HTML content. It also enables custom 3D rotation animations. CSS3 Transforms are used to create this visual “3D” isometric effect.

View Plugin: http://www.zachstronaut.com/projects/rotate3di/