Nos mandan un artículo de como utilizar protocolos basados en XMPP para crear notificaciones en tiempo real en ambientes de WEB:
Real-Time apps have been popularized by social-notification tools like Twitter and Friendfeed. With a Real-Time web app you can get website information as soon as it’s published. Learn techniques that allow you to create responsive, continually updated web applications that conserve server resources while providing a slick user experience using jQuery, XMPP and PHP.