Global Holocene Volcanoes (Smithsonian)
Global Vulcanism Program of the Smithsonian National Museum of Natural History has a world map and listing of all volcanoes on Earth, including type and status.
Internal Earth Processes - 36 multimedia resources from Teachers' Domain Earth and Space Science multimedia resources (movies and interactives).
Website discussing the origin of hot spot vulcanism.
Mount St Helens Updates. See also Pacific Northwest Seismographic Network http://www.pnsn.org/
USGS Hazards Gateway - about earthquakes, floods, hurricanes, landslides, tsunamis, and volcanoes.
Volcano World - Provides information on recent volcano activity.