HTML5 Canvas Drawing with WebSockets, Node.JS & Socket.io | Dev Breakthroughs | Scoop.it
From wesbos.com - November 3, 2011 8:22 PM

Web sockets and Canvas are two really cool features that are currently being implemented into browsers. This tutorial will give you a short rundown of how they both work as well as create a realtime drawing canvas that is powered by Node.js and web sockets.