Do you like your zombies thinking or mindless? There have been quite a few anime in recent years with "zombies" that are more or less just super-powered people, like Corpse Princess and Sankarea. Granted, Sankarea looks like a comedy, but there are some serious issues lurking just beneath the surface.
On the non-thinking side, we have Hellsing Ultimate, in which vampires will create and control temporary zombie hoardes. Then, of course, you have Resident Evil: Degeneration, though I'm not sure that that counts as an anime.
There are probably more, but I don't track all of them since I'm not a zombie buff.
Edited by Manhiem (01/13/13 08:49 AM)