Brandon Aaron » Blog Archive » New Plugin: Live Query
Live Query, previously called Behavior, utilizes the power of jQuery selectors by binding events or firing callbacks for matched elements auto-magically, even after the page has been loaded and the DOM updated. This means you can assign a function to a set of elements ("a" for example) and later, when you add more "a" elements they inherit those functions. Cool.
http://blog.brandonaaron.net/2007/08/19/new-plugin-live-query/