Hi,
I am Avinash Mangipudi. I am learning JMeter at the moment. I am currently working for Larsen and Toubro Infotech at Bengaluru, India. There are a lot of load generation tools out there in the wild. Ability to generate as much load as needed and ability to modify the application to suit to your needs are 2 powerful concepts and JMeter provides both, for free.
Hats off to you JMeter.
Parametrisation [http://jmeterworld.wordpress.com/2008/12/16/simple-parameterization-in-jmeter/]
Correlation [http://90kts.com/blog/2008/jmeter-tips-and-tricks-correlating-with-regular-expressions/]
[JavaRequest] [http://perflab.blogspot.com/2009/09/writing-jmeter-tests-using-javarequest.html]
There' s a book out there and it seems to be available in India
[http://www.flipkart.com/apache-jmeter-emily-h-halili/8184045778-aw23fu0zoc]