Web applications tend to continuously evolve and thus need thorough, yet lean and automatic, regression testing. In this installment of Software Technology, Andreas Kornstadt and his colleagues describe automatic regression testing for Web applications that uses the Selenium testing framework. Selenium is portable open source software available for Windows, Linux, and Macintosh. Tests are written as HTML tables or in a number of programming languages and can run directly in most Web browsers. Andreas and his colleagues also provide many useful testing hints for practitioners. We look forward to hearing from both readers and prospective column authors about this column and the technologies we want to know more about.