Sebastian Bergmann has quickly posted about a PHP-GTK testrunner that's been created for PHPUnit:

Tobias Schlitt has announced the development of a PHP-GTK2-based test runner for PHPUnit. It will be part of the upcoming PHPUnit 3.2 release (roadmap). Screenshots are here.

Definitely a welcome addition to an already outstanding unit testing tool - great work Tobias! Check out his blog for more details on how to install the tool and get started testing your apps.