Few blogposts focusing on ØMQ have appeared recently. Follow the links below to read more:
http://www.coastrd.com/zeromq-messaging
http://edparcell.posterous.com/excited-by-zeromq
http://blog.andrewvc.com/zeromq-sockets-theyre-a-big-deal
http://dotrb.com/blogs/55/posts/183
http://kfsone.wordpress.com/2010/07/05/zeromq/
Also, Nicolas Piel's introduction to ØMQ was translated into Russian:
http://www.opennet.ru/opennews/art.shtml?num=27137

Martin, thanks for these, they make fun reading.
Portfolio
Pretty much the first thing I did with ZeroMQ was take advantage of its messaging for parallelism. I've made the source to the resulting "Async::Worker" classes in C++ available here
http://www.kfs.org/oliver/async/
and the discussion page for it is here:
http://kfsone.wordpress.com/2010/07/21/asyncworker-parallelism-with-zeromq/