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Keith Payea - Scroll down to the Amateur Science section
Burt Katzung
Also see our article on this subject.
Choosing a Telescope for Astronomy
Extreme Ultraviolet Explorer Satellite
Gamma-ray Large Area Space Telescope (GLAST)
Hubble Heritage Project
Swift - Video on how Swift's mission and operation
XMM-Newton
Astronomy
Astronomy Now (United Kingdom)
Sky and Telescope
Star Date
Night Sky Observer
SkyNews
The Optics Project
UV and Visual Absorption Spectroscopy
Astromart
Astromart Review
Cloudy Nights Telescope Reviews
Ed Ting's Scope Reviews
Orion Telescopes
Anacortes
Antares
Apogee
Astro-Physics
BES Optics Inc.
Celestron
Coronado
Denkmeier Binoviewers
Discount Binoculars (Their retail store is Out of this World in Mendocino, on Main Street)
Hands On Optics
Meade
Oceanside Photo and Telescope (OPT)
Orion Telescopes and Binoculars