If you've previously purchased DREAMSONGS or GRRM: A RRETROSPECTIVE (which are the same book), you've already read "Meathouse Man." If you haven't, well... I probably ought to warn you that it's the darkest, nastiest, most despairing story that I ever wrote.
Lots of classic zombie stories in the book, though. For more info, check it out at:
http://www.johnjosephadams.com/the-living-dead/