David Runia has announced that the premier journal dedicated to the study of Philo, the Studia Philonica Annual, has entered into rest at Yale University, thanks to Greg Sterling.
Here is the site: Studia Philonica Annual.
The site is well done and has indices to all the editions of the journal in its latest resurrected form. It also has links to the current projects of the Philo of Alexandria group of SBL.
If you are wanting to dig into Philo more deeply, this is the nexus of the kosmos noētos.