American Experience: Fatal Flood http://www.pbs.org/amex/flood/
Companion site to the PBS documentary about the 1927 flooding of the Mississippi River. Includes timeline, maps, profiles of people and events, teacher's guide, and info about the film.
HazNet http://www.haznet.org/
Provides information on coastal natural hazards (such as hurricanes and shoreline erosion), hazard planning, and things that can be done to reduce personal and economic losses. From U.S. National Sea Grant College Program.
Avalanches