http://www.bitsandpix.com/entry/jquery-bubblebind-jquery-plugin-to-bind-bubbling-events/

$("#parentDiv").bubbleBind("span","click",function(){ alert("you clicked on an span tag: " + $(this).html()); });

I developed a dead-trivial jQuery plugin to make binding of bubbling event as similar as possible to the traditional jQuery direct binding. 

While doing a jQuery.bind and jQuery.is is not hard it itself, the current API tends to make the default bind to be direct which could have serious performance consequences in some circumstances. 

I think that having something similar to bubbleBind (better written and more complete) at the core will entice developers to think about their event binding architecture and write better performing jQuery Web application. And it goes well with the "write less, do more"

This is just a thought, not even an opinion. 

Best,