Theres almost limitless benifits once you have added jQuery to a site, (This.) is expanded well.
http://remysharp.com/2007/04/12/jquerys-this-demystified/
Blogosphere posts on JQuery This Explained
(Automatically generated External Blogposts of no relation to this blog)
Teamwork 4.0 GUI and jQuery mbComponents « Matteo Bicocchi’s Blog
jQuery Tutorial: DOM Manipulation and sorting
Changing Form Input Styles on Focus with jQuery
Movable Type Monday: Custom Header, [...]