In this tutorial Nettuts takes as they say,”an average everyday website and enhancing it with jQuery. We will be adding ajax functionality so that the content loads into the relevant container instead of the user having to navigate to another page. We will also be integrating some awesome animation effects.” Very fun AJAX tutorial.

Website: http://nettuts.com/javascript-ajax/how-to-load-in-and-animate-content-with-jquery/