jInvertScroll is a lightweight plugin for jQuery that allows you to move in horizontal with a parallax effect while scrolling down.It's easy to setup and requires nearly no configuration.
Fraction Slider is a jQuery plugin which adds a fully customizable element slider to your website.
It allows you to animate multiple elements per slide. Set different animation methodes like fade or (from) left, delays and easing for each element, or spimple set some defaults in the plugin options.
You also have full layout/design control through html and css (every html-element can be animated).
Destaque is a simple slideshow plugin with built-in parallax effect.