Here is a selection of some recommended sites.
AstronomyNow.com - Astronomy Now Online: Official website of UK’s best-selling astronomy magazine. Includes a section on magazine stories, a news archive, a sky chart, links to resources, and an online store.
Astronomy.com - Official site of the world’s best-selling magazine – Astronomy. Contains the following sections: news, videos, astronomy for kids, an introduction to the sky, urban skies, astronomy equipment, a special subscribers section.
Please feel free to share your favorite astronomy websites along (with a short description).