Lots of General Astronomical Stuff
Solar System Live contains an interactive solar-system orrery and ephemeris as well as lots of free Windows-based software.
Astronomy Picture of the Day
Astronomy Cafe is an Internet resource for the "Astronomically Disadvantaged".
Time and Date is a resource for learning about time zones and looking up sun and moon rising and setting times.
High Energy Astrophysics Science Archive Research Center : Astrophysics on the World Wide Web
StarBits is a dictionary of some 85,000 acronyms and abbreviations broadly linked to astronomy, space sciences, and related fields.
StarWorlds is the largest database of astronomy, space, and thousands of related organizations.
Astroweb : A list of many astronomy resources, sorted by category.
A list of Astronomy Resources from the Yahoo service.
The World Wide Web Virtual Library: Astronomy and Astrophysics
Archive of astronomical images at Universite de Rennes, France
Today at NASA
Miscellaneous stuff at NOAO containing links to a LOT of Astronomy (and other) sites (including some listed here)
Sky View Cafe online interactive planetarium software.
Many more astronomy links