Load Testing Tools Directory: Automated Testing of Software and Web Site Performance
Performance and Load Testing Resources
OpenSourceTesting.org - Performance section
Articles
Modeling the Real World for Load Testing Web Sites
Best Practices for Speeding Up Your Web Site
Rich-client application performance, Part 1: Tools, techniques, and tips for analyzing performance
Designing Performance Testing Metrics into Highly Distributed J2EE Applications
Automation for the people: Continuous testing
Reference Metrics for Service-Oriented Architectures
Videos
Using open source tools for performance testing
Extreme JavaScript Performance
High Performance Web Sites: 14 Rules for Faster Pages
Website Stress Testing using JMeter