I often find cool and (sometimes) useful jQuery plugins, so I want to share a few that I like. I plan to share more in the future.
Adipoli jQuery Image Hover Plugin
Includes several different effects to highlight images as the mouse hovers over them.
jQuery File Upload
File Upload widget with multiple file selection, drag&drop support, progress bars and preview of images, audio and videoy. Supports cross-domain, chunked and resumable file uploads and client-side image resizing.
Customized checkboxes and radion buttons for your forms.
A plugin to make dropdown-boxes (especially long ones) easier to use. I looked at using this in a project, but ultimately opted to use another plugin, for different reasons. Chosen is still a good tool.
This is the plugin I selected over Chosen. The content of the dropdown can be supplied using an Ajax call, returning JSON, and there are a large number of configuartion options. The plugin support filtering and type-ahead, as well as many other useful functions.
A jQuery plugin for scroll animations.
Sticky is a jQuery plugin that gives you the ability to make any element on your page always stay visible.