For those Python developers who want to try socket.io, there's an implementation of server part of socket.io in Python: http://www.gelens.org/code/gevent-websocket/
Correct me if I am wrong, but isn't this just websockets, not the whole of Socket.IO (i.e. fallbacks for non-supporting browsers)? There is also: http://github.com/SocketTornadIO/SocketTornad.IO which is a port of Socket.IO that runs on Tornado.
Indeed, sorry. Here's the correct link: http://bitbucket.org/Jeffrey/gevent-socketio (by the same guy)