Harvard University
Harvard Smithsonian Center for Astrophysics: The Constellations
Based on images from the Chandra X-Ray Observatory, this is an excellent glossary of all the constellations, including the ones that make up the Zodiac. Find images, photographs, and an excellent background narratives concerning each...
Other
Constellations Web Page: The Constellations
Information about 88 constellations, including the myths associated with them and details of the major astronomical objects that are part of them.