It is worth looking at Sustrik next project: http://nanomsg.org/ which is still in alpha version. ZMQ rewritten. He's got awesome blog http://250bpm.com/blog where he mentions lot of things that he decided to do differently in nanomsg and the reasons behind it. Check out: http://250bpm.com/blog:23 (I hate ZMQ contexts) and http://250bpm.com/blog:22 (how we are doomed to rewrite protocols on top of existing protocols and solving same problems again). His other blog posts are also of a great quality.
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It is worth looking at Sustrik next project: http://nanomsg.org/ which is still in alpha version. ZMQ rewritten. He's got awesome blog http://250bpm.com/blog where he mentions lot of things that he decided to do differently in nanomsg and the reasons behind it. Check out: http://250bpm.com/blog:23 (I hate ZMQ contexts) and http://250bpm.com/blog:22 (how we are doomed to rewrite protocols on top of existing protocols and solving same problems again). His other blog posts are also of a great quality.