Parallax is a cool tool from Stephen Band. Think of looking through a camera and having layers of objects at various distances moving around. This library achieves that effect using multiple using static images, one for each layer.

"Parallax is [a jQuery library that] turns a selected element into a 'window', or viewport, and all its children into absolutely positioned layers that can be seen through the viewport. These layers move in response to the mouse, and, depending on their dimensions (and options for layer initialisation), they move by different amounts, in a parallaxy kind of way."