My favorite web technology is quickly becoming the WebSocket API. WebSocket provides a welcomed alternative to the AJAX technologies we’ve been making use of over the past few years. This new API provides a method to push messages from client to server efficiently and with a simple syntax. Let’s take a look at the HTML5 WebSocket API: it’s use on the client side, server side, and an outstanding wrapper API called Socket.IO.
via David Walsh Blog – WebSocket and Socket.IO. Really great instructional and demo of a neat technology.