This is an excellent review of the two technologies from the company that created them both. A few times here on HN, I've seen people attempt to argue that ZeroMQ is a better AMQP or vice-versa. Instead, this document explains their differing philosophies and relative strengths and weaknesses.
> AMQP will become popular with banks because it looks like enterprise messaging but is much cheaper in terms of license costs. ØMQ will become popular with everyone else because it looks like TCP sockets but is much cheaper in terms of lines of code.<p>Beautiful.