This is a simple MooTools Plugin for Event Delegation, now I would suggest the MooTools More 1.3 Delegation though
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README.md

Simpler Element.Delegation

This extension is a another fresh look at event delegation. No addEvent('relay(a)',fn) kind of things, but a more simple API

Screenshot

How to use

This is the most simple example how you can use this Element.Delegation

#JS
document.body.addDelegate('click','a',function(){
    // do it!
});

More advanced Selector example

#JS
document.id('myElement').addDelegate('click','a[href^=mailto:]',function(){
    // so you want to mail someone ?
});

More delegates

#JS
document.id('myElement').addDelegates({
    'click': {
        'a[href^=mailto:]': function(){
            // so you want to mail someone ?
        },
        'a[a.email]': function(){
            // Do something else
        }

    },
    'mouseover': {
        'p': function(){
            // You hovered a paragraph
        }
    }
});

Remove delegates

#JS
var fn = function(){};
document.id('myElement').addDelegate('click','a',fn);   
document.id('myElement').removeDelegate('click','a',fn);

Remove more than one at the time

#JS
var fn = function(){};
document.id('myElement').addDelegate('click','a',fn);   
document.id('myElement').removeDelegate({
    'click': {
        'a': fn
    }
});

Add delegates to a new Element

#JS
new Element('div',{
    delegates: {
        'click': {
            'input:checked': function(e){
                // Your code
            }
        }
    }
});