If you’re looking for ActiveMQ documentation, you can try reading online chapters of “ActiveMQ in Action” using Manning Early Access Program (MEAP) - http://www.manning.com/snyder/
New chapters has just been added:
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Chapter 2 provides a detailed overview of ActiceMQ
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Chapter 4 explains ActiveMQs message persistence options
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Chapter 7 addresses the aspects related to providing messaging services to different platforms
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Chapter 12 explains performance tuning techniques
I hope you’ll enjoy reading them.