Check out the new CDC bulletin, Preparedness 101: Zombie Apocalypse.
Noach says the material lacks a critical step, identifying the type of zombie you are facing. So I'll give you his recommendations.
Fast zombies, now the most common, require that you are in a group, have munitions and food and a hand-to-hand weapon.
Slow zombies are less of a problems. The main suggestion, don't get cornered. They can be killed in the normal zombie-way.
The best place to face zombies is a prison. There are guns, food and you can get in a cell and they can't get to you.
Finally, if faced with 28 Day Later zombies, or "infected" zombies, you need to plan carefully. You must avoid the projectile vomit; it is immediately infectious. But they are vulnerable to being shot anywhere on their bodies. A head shot is not essential.
Be careful out there. PRM