jQPanView is a jQuery plugin that creates a pan view when you mouse over the thumbnail, it is inspired by panView.
jMedia is a jQuery plugin for unobtrusive, accessible and flexible multi-media embedding. It supports Flash, Quicktime, Real, WindowsMedia and Shockwave/Director. It is inspired by SWFObject, UFO and sIFR.
jQuery ToggleFormText is a plugin that toggles pre-defined text in form fields, when focused or blurred.
Phatfusion slideshow for mootools generates transition between images.