On his blog, Sebastian Bergmann has a quick post about the PHPUnit support that he's been shown in an upcoming patch to the PHPEclipse project.
The PHPUnit part of this (a TestListener that communicates via a socket with Eclipse) has been committed to CVS. Stephen will make his plugin code available shortly.
Steven Balthazor sent me a first version of his PHPUnit integration for PHPEclipse today.
You can grab the update to your PHPUnit install from that CVS location, but keep an eye out for the patch to make its way out - they're both required to get it working.