jScrollPane
Pretty, customisable, cross browser replacement scrollbars Demo
jcarousel
Riding carousels with jQuery.Demo
jquery-carousel
Another jQuery carousel
ikSelect
Stylize html selects using jQuery Demo
ResponsiveSlides.js Simple & lightweight responsive slider plugin (in 1kb) Demo
fancyBox
fancyBox is a tool that offers a nice and elegant way to add zooming functionality for images, html content and multi-media on your webpages. Demo
Nivo-Slider
Nivo Slider - The Most Awesome jQuery Image Slider Demo
Jcrop
Jcrop (official) - Image Cropping Plugin for jQuery Demo
Slider Kit
The purpose of Slider Kit is to gather common slideshow-like jQuery functionalities (such as news sliders, photos galleries/sliders, carousels, tabs menus) into one lightweight and flexible plugin combined with ready-to-use CSS skins Demo
colorbox
A light-weight, customizable lightbox plugin for jQuery Demo
ie7-js
IE7.js is a JavaScript library to make Microsoft Internet Explorer behave like a standards-compliant browser. It fixes many HTML and CSS issues and makes transparent PNG work correctly under IE5 and IE6. Demo