The U.S. Centers for Disease Control put up an honest-to-God article on preparing for a zombie apocalypse, so great. They happen to mention, as well, that it can be handy for other emergencies such as tornadoes and hurricanes.
Preparedness 101: Zombie Apocalypse May 16th, 2011 - I love it when the Federal government has a sense of humor! :-) Bet you didn't know the CDC included how to prepare for a zombie apocalypse. http://blogs.cdc.gov/publichealthmatters/2011/05/preparedness-101-zombie-apocalypse/