Your Sky - Interactive sky mapping. You select a region of the sky in your browser and the server displays a map. Very useful and full-featured - Ed.
Out of This World - The Golden Age of the Celestial Atlas
Solar System Live - Interactive Orrery of the Web.
Stars and ConstellationsThe Dome of the Sky - An online planetarium showing views of the stars and constellations at different latitudes and different dates through the year.
Maps of the Solar System - Collection of maps of the planets and moons, many derived from multispectral images taken by NASA spacecraft.
3-D Starmaps - Do your own 3-D star maps. See stars like in your favorite SF
SkyView - The Internet Virtual Telescope generating images of any part of the sky at wavelengths in all regimes from Radio to Gamma-Ray.
MyStarsLive - Web-based interactive star chart generator. Get a preview of your own city's night sky - with moon phase.
Sky Atlas 2000.0 - A review of this popular printed sky atlas by Tom Polakis.
Virtual Sky - A portal to multiple representations of the night sky, including a high-resolution (1 second/pixel) optical survey of the Northern sky and the Uranometria engravings from 1603.
Skymaps - Maps of the night sky for the northern and southern hemispheres. Designed to be printed and used. Updated each month.
Solar Neighborhood - Interactive 3D map and information on stars within 25 light-years of Earth.
Star Gazer - View a star map for any time and latitude. Click on stars for detailed information. Java program runs on version 4.0+ browsers.
Star Maps - Star maps generated from a number of cities.
Atlanta Sky Maps - Designed for naked-eye viewing, these are sky maps updated weekly for the Atlanta, Georgia, area.
Lunaria Calendar and Sky Maps - Designed for naked-eye viewing, there are sky maps for several U.S. cities, updated weekly.