Without a doubt, George Romero is horror royalty. Storming onto the scene in 1968 with a film as transformative of the genre as any to this day, Romero has woven a variety of genre tales featuring everything from witches to vampires to post-apocalyptic motorcycle jousters. But the director never truly seems as comfortable as he does when he's working with his muses, the walking dead. For the second time in three years, Romero has returned to this wellspring of inspiration with "Diary of the Dead." Sadly, his latest effort proves that for this old master, that well may finally be dry.