jQuery CSS3 animation queue is a plugin to chain CSS3 animations one at a time, as well as delay the animation until the element is in the browser viewport.

ScrollMation is designed to help developers animate elements on the scroll. Elements flyin and fade out as the user scrolls down the page. It's not super glamorous but it's a start.

Web Developer John Polacek has created a jQuery plugin that makes webpage elements respond to scrolling with animation.