For the last week or so I've been hacking on implementing an Avro RPC server on top of the Tornado IOLoop. It's pretty barebones right now and hasn't been tested very thoroughly, so user beware. It comes with a single-threaded server and a server that uses a thread pool to execute the responder requests. I figured I'd throw it out there in case anyone is interested.
Source here: https://github.com/richid/tornavro
