If you are a java developer, you can use jwebsocket to implement the server. there are various examples on their site to start with as I'm also going through some of them.
Briefly from their website
jWebSocket is provided to you to create innovative HTML5 based streaming and communication applications on the web. HTML5 WebSockets will replace the existing XHR approaches as well as Comet services by a new flexible and ultra high speed bidirectional TCP socket communication technology. jWebSocket is an open source Java and JavaScript implementation of the HTML5 WebSocket protocol with a huge set of extensions.
