reference http://www.leggetter.co.uk/real-time-web-technologies-guide/
Firebase (join Google) http://www.firebase.com OR http://firechat.firebaseapp.com/
Real Time Notifications With PHP by Gonzalo Ayuso - 2011 http://gonzalo123.com/2011/03/14/real-time-notifications-with-php OR http://php.dzone.com/news/real-time-notifications-php
Real Time Notifications II With node.js and socket.io by Gonzalo Ayuso - 2011 http://gonzalo123.com/2011/05/23/real-time-notifications-part-ii-now-with-node-js-and-socket-io/
socket.io 1.0 (nodeJS required) http://socket.io/ OR http://github.com/Automattic/socket.io
Introduction & Installation of Node.js by stoimen http://www.stoimen.com/blog/2010/11/16/diving-into-node-js-introduction-and-installation/
Diving into Node.js by stoimen http://www.stoimen.com/blog/2010/12/02/diving-into-node-js-a-long-polling-example/
APE (Ajax Push Engine) http://ape-project.org/
HTML5 Push Notifications via pusher.com http://html5-realtime-push-notifications.pusher.io/ OR http://github.com/pusher/html5-realtime-push-notifications
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