I started a new series on the [topcoder] blog called "Phasers on Innovate where I simply talk about cool tech stuff and build things.
Late last year Heroku started supporting WebSockets so I thought I would take a stab at rewriting our Corona application which currently uses Socket.io. Corona was a nifty little app we had over at CloudSpokes that popped pins on a map in real-time whenever members would login, ask questions, submit for challenges, etc.
The app was mesmerizing in that it would show the activity on the platform by geography and you could literally sit and watch the map all day.
So I put togther a little video on how pubsub works with node and websockets. Hope you find it useful. You can find the server and client code on our github repo.