I wonder about the rainy day cases of this - what if a connection is lost for a minute? will the recovery deliver all the missing messages? will it restore consistency once the connection is restored?

Also, Jet is based on installing a single router server. What about scaling that server? HA? If you install two such servers, do they communicate? Or does each create it's own communication domain?

What is the difference between SocketIO and this?

Socket IO is a service, this is something you install on your server

> Socket IO is a service

I'm not sure what you mean by that. Socket.io is something you install on your server as well

http://socket.io/download/

http://socket.io/get-started/

I was sure socket.io is a service you use... for some reason...

But you are right - it is exactly the same, only that socket.io looks more solid.

Perhaps you're thinking of Pubnub.com ?