Great piece of work.

What about using socket.io to provide a real-time collaborative environment?

Here is the typical use case: my business partner is in Australia and I'm in China. We often browse the internet "together" to share some design inspirations. For now, we have to include position info in the skype call to say "if you look at the trending keywords on the right hand side, blah, blah". It'll be super nice for us to look at the same page and I can see his mouse movement.