[soravux]

We are currently using ZeroMQ in our distributed task framework in Python, SCOOP (http://scoop.googlecode.com).

ZeroMQ was chosen as the communication library because it simply works and isn't bloated. No need to implement the state-machines for common patterns in our sockets, ZMQ does it and fast. It doesn't replace a standard socket, though, it only add a layer of functionalities over it.

While using it, we found some minor negative point such as delays needed by the socket upon shutdown, which require sleeps between unit tests, or the random port connector that is not random... But overall, ZMQ is a tool that saved us much developing time and should not be overlooked by distribution systems.