The “object” that you get back in event.target is a DOM element and you can do anything you can do with a DOM element in Javascript with it. Here’s an example of opening a Javascript alert with the ID of the DOM node:
twttr.events.bind('click', captureElement);
function captureElement(event) {
var dom_element = event.target;
var dom_id = dom_element.id;
var dom_class_name = dom_element.className;
alert("The DOM element that was clicked had this id: " + dom_id + ". And class name: " + dom_class_name);
}