SearchSoftwareQuality.com recently posted a series of articles I wrote on performance testing with JMeter as a tutorial. You can find it online. The series includes the following articles: 

• Running your first load test with JMeter
• Recording and running software load tests with JMeter
• Tips for debugging your JMeter tests
• Tips for Interpreting JMeter Results

I recently finished a six article series on working with IBM Rational Quality Manager:

• Getting started with IBM Rational Quality Manager


• Managing your first project with IBM Rational Quality Manager


• Test planning using IBM Rational Quality Manager


• Test analysis and reporting using IBM Rational Quality Manager


• Lab Management using IBM Rational Test Lab Manager


• Integrating IBM Rational Functional Tester and IBM Rational Performance Tester with IBM Rational Quality Manager