Click2Disasters 
Details of the sinkings of the Lusitania and Titanic, the Challenger explosion, the Tenerife airport crash, the Hindenberg disaster, and the Galveston hurricane. From Awesomestories.com.
http://www.click2disasters.com/Disaster Finder
NASA search engine for disasters and disaster management programs.
http://disasterfinder.gsfc.nasa.gov/
The Disaster Page
Facts, dates and resource links for natural and manmade disasters.
http://members.aol.com/letsgorngr/tragic.html
World's Deadliest Disasters
History's most serious disasters, both natural and manmade.
http://www.geocities.com/freepagesfree/disasters.htm
Disaster City
Official reports, news articles, and photos of manmade disasters, including airline crashes and military mishaps.
http://www.teex.com/teex.cfm?pageid=USARprog&area=USAR&templateid=1117
Epic Disasters
Hurricanes, earthquakes, floods, eruptions, tornadoes, disease and mining.
http://www.epicdisasters.com
Famous Wrecks
Articles and images.
http://www.famouswrecks.com
