Micro Image Gallery is a jQuery plugin that will transform a set of images on your website into a miniature gallery. There’s an option to have previous / next buttons, a grid view and the size of the gallery can be adjusted (102, 162, 202 px).
TouchTouch is a jQuery plugin that turns a collection of photos on a webpage into a touch-friendly mobile gallery. It works on all major browsers (except for IE7 and below) and most importantly is specifically designed with iOS and Android in mind.
Camera slideshow is an open source project, based on Diapo slideshow, but improved a lot. You can download it and use for free.
Camera slideshow requires jQuery 1.4+ and other jQuery plugins are necessary if you want to use some functionalities: jQuery Easing and a customized version of jQuery Mobile to use Camera with mobile devices.
jFlickrFeed Plugin makes it easy to pull Flickr feeds and display them on your site.
Galleriffic is a jQuery plugin that provides a rich, post-back free experience optimized to handle high volumes of photos while conserving bandwidth
bgStretcher (Background Stretcher) is a jQuery plug-in which allows you to add a large image (or a set of images) to the background of your web page and will proportionally resize the image(s) to fill the entire window area. The plug-in will work as a slideshow if multiple images mode is used (the speed and duration for the slideshow is configurable).
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.
The imgPreview plugin allows your users to preview an image before clicking on it and, out of necessity, will preload the image so when a user does click through to it there is no waiting time!