It depends on what your specific needs are with respect to persistence and other aspects of your application. Take a look at http://blogs.digitar.com/jjww/2009/01/rabbits-and-warrens/ and read about RabbitMQ and ZeroMQ to see if either sounds like a solution for your problem.
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Do you have any recommendations for something simple?
It depends on what your specific needs are with respect to persistence and other aspects of your application. Take a look at http://blogs.digitar.com/jjww/2009/01/rabbits-and-warrens/ and read about RabbitMQ and ZeroMQ to see if either sounds like a solution for your problem.