When registering event handlers in jQuery, chaining ‘mouseup’ after ‘click’ after ‘focus’ can produce, what is, in my opinion, ugly code:

$(elem)
    .focus(function(){...})
    .click(function(){...})
    .mouseup(function(){...});

It really depends on taste; personally I’d prefer a far more intuitive interface which would enable me to specify all event handlers within a single declaration:

$(elem).events({
 
    focus : function(){...},
    click : function(){...},
    mouseup : function(){...},
 
    // Namespaced event:
    'mousedown.namespace' : function(){...},
 
    // Custom event:
    exit : function(){...}
 
});

Made possible with a tiny plugin:

jQuery.fn.events = function(o){
    for (var i in o) {
        this.bind(i, o[i]);
    }
    return this;
};

In my opinion this offers a semantically superior means to bind event handlers in jQuery.