Ready.gov This site offered by FEMA gives suggestions on how to prepare and survive natural disasters. Site available in various languages.
The Department of Homeland Security gives suggestions on how to be prepared should a terrorist attack occur. Look under the heading called "Preparedness, Response, Recovery."
DisasterAssistance.gov Information from several government agencies about preparing for and recovery from emergencies.
Disaster Preparation and Recovery from MEDLINEPlus News, general overviews and helpful links for coping with trauma, dealing with specific conditions in an emergency, and information for seniors, teens and kids.