If you are shopping for a new messaging queue and looking at RabbitMQ, or if you're just looking for ways to improve your existing RabbitMQ use case, there are 2 articles you really need to look at.
RabbitMQ Performance Measurements Part 1 and Part 2 are VMware's definitive benchmarking and performance analysis outlines for various use cases. Part 1 covers flow control while part 2 looks at some simple scenarios with one publisher and one consumer publishing as fast as they can. It also looks at message sizes and large queues.
Do you know any other good RabbitMQ performance resources? Share them!