Plate Tectonics Websites

The United States Geological Survey (USGS)

Up-to-date information about tectonic hazards and events.  Excellent case-study material, and maps showing you the latest eruptions, ground movements and tsunamis.

http://www.usgs.gov/hazards/

The Bristish Geological Survey (BGS)

Some information about tectonics, but not as good as the USGS. 

http://www.bgs.ac.uk/home.html

National Geographic - Make your own earthquake!

Pretty pictures (of course), good case-study help, and a chance to create your own earthquake! 

http://www.nationalgeographic.com/forcesofnature/