Links to volcano sites:

http://dailynews.yahoo.com/fc/Science/Earthquakes_and_Seismology
Very current information through Yahoo.com that has recent volcano news.

http://volcano.und.nodak.edu/
This site has information about past volcanoes, a "Today in Volcano History" section, descriptions of major volcanoes, and much more.

http://www.geol.ucsb.edu/~fisher/
This "Volcano Information Center" has many volcano topics covered in depth. It also includes a links section of its own.

http://volcano.und.nodak.edu/vwdocs/volc_images/volc_images.html
Here are many pictures of different volcanoes (not eruptions, but the actual volcano). They are assorted by region, then place, then actual volcano. Very good site.

More information about how/why volcanoes erupt can be found [here]

Information about major past volcanoes can be found [here]

More information about what a volcano is can be found [here]

More volcano pictures can be found [here]