On the PHP.net website, the official announcement for TestFest 2008 has been posted:

The PHP-QA team would like to announce the TestFest for the month of May 2008. The TestFest is an event that aims at improving the code coverage of the test suite for the PHP language itself. As part of this event, local User Groups (UG) are invited to join the TestFest. These UGs can meet physically or come together virtually. The point however is that people network to learn together.

The event is not only a teamwork/friendship building effort but will also help out the PHP.net mentors in a serious way - testing has largely been their responsibility and having a wealth of user-submitted tests to help out cuts their workload dramatically.

You can find out how to get you and your local PHP user group involved, head over to the TestFest homepage.