Ben Ramsey, of the PHPC project, and Matt Kern are creating a PHP user group in Atlanta. As described here, Matt actually thought of the idea three days before Ben. Maybe this will make a funny story once the group gets going. I wish them both the best of luck.
After having been contacted a few times now regarding PHP user group creation, I have realized that we, the PHP community, need something similar to Perl Mongers. I hope to have more information on this soon, as I plan to do something about it.