I'm greatful for the 0MQ port on R2 R3 and Red which makes for a great potential way to get applications written in various Rebol versions to talk to one another and much more.
I just found out that Martin Sustrik, the original 0MQ developper, went on to fix numerous 0MQ issues with the nanomsg library
http://nanomsg.org/
http://nanomsg.org/documentation-zeromq.html
among other things fixed the threading model, performance, scaling subscription matching.
Hoping Dirkjan might read this and gives his thoughts about a Red nanomsg port !