With the trend of SOA and webservers like Mongrel2, perhaps its a good time to start putting the more esoteric languages in production in the form of small services (w/ ZeroMQ for example).
Agreed, zmq and some form of cross language serialization library (we're using protocol buffers) is a seriously powerful tool to have in your box. There are some patterns that seem perfectly suited to a small piece of haskell at the end of a zmq socket.
