The Centers for Disease Control (CDC) has been thinking about the potential for a zombie apocalypse. You can find a page on Zombie Preparedness on their website, as well as a graphic novel (9Mb pdf).
If you are generally well equipped to deal with a zombie apocalypse you will be prepared for a hurricane, pandemic, earthquake, or terrorist attack.
— Ali Khan (2011) (Head of the Office of Public Health Preparedness and Response at the Centers for Disease Control and Prevention): Quoted in Zombie Preparedness on the CDC website.
NOTE: The CDC recommends you quarantine zombies rather than kill them; Kyle Munkittrick, of the Pop Bioethics blog disagrees.