History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. It supports jQuery, MooTools and Prototype.
Kwicks for jQuery is a plugin providing sexy sliding panels with an emphasis on navigational interaction. Kwicks was originally a port of a MooTools effect (of the same name), but has since evolved into a highly configurable and versatile UI component.