Quora discussion: http://www.quora.com/RabbitMQ/RabbitMQ-vs-Kafka-which-one-fo...
RabbitMQ developer on the kafka-users list: http://mail-archives.apache.org/mod_mbox/kafka-users/201306....
SO discussion on several queuing systems: http://stackoverflow.com/questions/731233/activemq-or-rabbit...