jQuery Ambiance allows you to create notifications on the fly by just calling the function and providing some information
An alert alternative for jQuery that looks good. Apprise is a very simple, fast, attractive, and unobtrusive way to communicate with your users. Also, this gives you complete control over style, content, position, and functionality.
Reveal is a jQuery plugin for dead simple modals that comes with some sexy base CSS and can be implemented programatically or with the new HTML5 custom data attributes (data-attribute).
Display text, html content, images and ajax requests with 5KB code.
noty is a jQuery plugin that makes it easy to create alert, success, error and confirmation messages as an alternative the standard alert dialog. The notifications can be positioned at the top, topCenter (like GMail), bottom, centre, top left or top right. There are lots of other options in the API to customise the text, animation, speed, buttons and much more.
rlightbox is a jQuery UI mediabox that can display many types of content such as images, YouTube and Vimeo videos. It has many unique features like Panorama and Live Re-size. Like other jQuery UI widgets, it is ThemeRoller ready.
prettyPhoto is a jQuery lightbox clone. Not only does it support images, it also support for videos, flash, YouTube, iframes and ajax. It’s a full blown media lightbox. It also comes with useful APIs so prettyPhoto can be launched from nearly anywhere.
jQuery LightBox Plugin is simple, elegant, unobtrusive, no need extra markup and is used to overlay images on the current page through the power and flexibility of jQuery´s selector. lightBox is a plugin for jQuery and it was inspired in Lightbox JS.