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

• Testing Web services' performance with soapUI
• Testing Web services with soapUI
• Using soapUI to mock Web services can offer insight on user acceptance
• Integrating soapUI into your unit testing practice

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