Martin Sustrik, Pieter Hintjens of iMatix and Brett Cameron of HP gave a great talk on messaging in general and 0MQ with AMQP in particular. OpenAMQ and 0MQ are both available on OpenVMS. See the BC&JA Web site for more information.
See the Session recording (WMV) file
and The Slides
Well worth the time spent listening and reading through the slides.