If you are following the tutorial on fzysqr.com, make sure to use appropriate tag for the tutorial.

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Tags / Tutorial:

 - v0.1: http://fzysqr.com/2011/02/28/nodechat-js-using-node-js-backbone-js-socket-io-and-redis-to-make-a-real-time-chat-app/
 - v0.2: http://fzysqr.com/2011/03/27/nodechat-js-continued-authentication-profiles-ponies-and-a-meaner-socket-io/
 - v0.3: http://fzysqr.com/2011/04/11/sending-your-clients-to-purgatory-a-node-jssocket-io-tutorial/