One blog, I have known about for some time is run by Brian Small, a PhD candidate at Baylor University, who specializes in Hebrews as well. The title comes from the opening words of Hebrews, hence, Polumeros kai Polutropos. If one is looking for the online haven for Hebrews studies, certainly this is it. Brian has amassed an astounding number of resources on his site, and one would certainly benefit from the hard work he has put in there.
Add them to your blogroll, now!