Other
Stephen F. Austin State University: Jupiter Events
An excellent site for amateur astronomers, with or without a telescope. Includes some links to information about Jupiter and its satellites and the collision of Comet Shoemaker-Levy 9
Space Telescope Science Institute
Hubble Heritage Project: Jupiter's Great Red Spot Links
This page provides images of Jupiter's Great Red Spot taken by the Hubble Space Telescope.
NASA
Nasa: Welcome to the Planets Jupiter
NASA offers a photo gallery of Jupiter images. Each image includes a detailed caption describing what the image is of, and the captions are also available in streaming audio.