of the Planets - Exactly what it says; gives all the specs for
each of our heavenly neighbors (size, mass, etc.). Or you could just look
the same information up in the inside front cover of any astronomy text.
The Movie - The official movie site contains a number of links
to genuine scientific sites about radio astronomy and the Search for Extra-Terrestrial
Intelligence (SETI). Oh, yeah, and some pictures of Jodie Foster.
Astronomy - Views inside the solar system as well as the material
covered above. One of the nicest features is the monthly astronomy calendar.
If you want to get your money's worth out of that telescope you got for
xmas you'll want to check this periodically.
Picture of the Day - The best of NASA. Often posts images
relating to the latest stories in the news. Good for prompting discussion.