Discovery of the Galilean Satellites
Some excerpts from Galileo's manuscripts.
http://www.jpl.nasa.gov/galileo/ganymede/discovery.html

Jupiter Satellites Events
Times for eclipse, occultation, transit, and shadow events.
http://www.projectpluto.com/jevent.htm

Satellites of Jupiter
Introductory information, focusing on discovery and naming.
http://es.rice.edu/ES/humsoc/Galileo/Things/jupiter_satellites.html

Eleven New Moons for Jupiter
satellite system.
http://www.ifa.hawaii.edu/~jewitt/jmoons/jmoons.html

International Outer Planet Watch
A program to study the time variability of the outer planets, primarily Jupiter.
http://jupiter.berkeley.edu/