Comics Publicity

Does anyone know how to contact the publicity department of Marvel, DC, and/or Dark Horse Comics?  I’ve been able to get graphic novel review copies from Image Comics, but I can’t seem to find contact information for the right people at the other comics companies.  I’d like to be able to consider a variety of graphic novels for review in my column, but right now my selection is extremely limited.  I could easily include a review of one each month, if I could get my hands on them.

Of course, maybe I’ll find all the contacts I need when I go to the NY Comic-Con next month.

UPDATE:

Dark Horse contact acquired!
DC contact acquired!