I'm planning to write a proper blog post with descriptions, examples & demos, but here are a couple of resources to get up and hacking with websockets and webrtc.
Probably the easiest/fastest way of getting this set up is using socket.io, it falls back to other methods for older browsers. You could use something like ws for a purer/'proper' websockets.
To send binary files (like photos in <input>
fields in my example) - you have to use binaryjs to chunk up the file for sending.
apprtc.appspot.com is definitely worth a look through - webRTC.io can be quite a handy abstraction layer.
In my talk - I hacked together a node server that broadcast any messages posted to the other clients (code on this gist). They were all on different ports to keep things simple.
The client code is a bit confusing at the moment, though I'll hopefully bring it together soon.
Other links that I mentioned:
http://shaker.io/
https://peercdn.com/
http://towtruck.mozillalabs.com