NinePlanets.org - Great easy-to-use website for general solar system information.
MoonConnection.com - The best website for anything and everything about our moon!
Astronomy Picture of the Day -- Amazing images that change daily! Also contains an archive and search feature to find an image of anything you can think of.
Heavens Above - A good website to obtain an evening sky map and the location of the ISS and most other satellites orbiting our planet.
NASA's Home Page - The home page of the company that leads our stellar discoveries.
Space.com - Another great source for NASA and Space news.