Last year Scott D. Mackie launched a blog on Hebrews and Philo, or as he states it: A blog focused on ancient Jewish and early Christian mysticism, particularly the Epistle to the Hebrews and Philo of Alexandria.
So far there are only 3 posts, all about articles he has published. It is to be hoped that he might find time to post more on Hebrews and Philo.
His last post contains a link to a .pdf version of the article he had published in Studia Philonica in 2009:
“Seeing God in Philo of Alexandria: The Logos, the Powers, or the Existent One?”
The Studia Philonica Annual 21 (2009): 25–47.
Philonica et Neotestamentica 
thanks for the mention Torrey!
a new piece on Philo’s mysticism, appearing in JSJ, should be up sometime in the next month-