This book covers 3 things useful to GM’s running zombie games.
20 random things a zombie could be doing, this should heighten a players paranoia as they see a group of zombies looking down into a storm drain or scratching at a building door. It makes a zombie hoard more interesting.
Zombie types is 100 jobs that zombies could have had before they became zombies, this allows the GM to personalize the zombies more.
Random zombie placement, this simple system allows for a good spread of zombies to get in the characters way.