Go here to get a list of high capacity mirror sites of the overrun JPL page. The Galileo Spacecraft is currently orbiting Jupiter and is sending back huge amounts of fascinating data. The most incredible data being sent back is about Jupiter's moons. Io is a beautiful, extremely volcanic moon that has an internal engine driven fiercely by the powerful gravity of Jupiter. The Moon shown here is Europa.
Most scientists believe that under the cracked ice is an ocean of water.
We also have pictures of the effects of volcanos erupting through the ice and water to form beautiful dark plumes. We know that here on Earth, areas exist deep under the ocean where there is no light and until recently thought to be uninhabitable by any form of life. Needless to say, we have found life deep in the oceans being supported by the heat and chemicals released by undewater volcanic vents and lava flows. By deduction, scientists believe that Europa could be our Solar Systems' best chance of having extraterrestrial life. It's truely worth your time.