Incorporated Research Institutions for Seismology
Interactive map of recent worldwide earthquakes, links to news stories
Earthquake Information Network
Huge American site; excellent starting point for further research.
Craig H. Jones, CIRES
Comprehensive list of earthquake maps all over the world
ETH Zürich

Earthquakes in Switzerland and worldwide

Bundesanstalt für Geowissenschaften, Hannover

Earthquakes in Germany, worldwide, historical earthquakes, catastrophies

GeoForschungsZentrum Potsdam
Earthquakes worldwide, visual aids for teaching, not just on earthquakes
Saint Louis University Earthquake Center

Earthquakes of previous two weeks