Audubon
Tips on finding the best binoculars for birding from Audubon, a site dedicated to connecting people with birds, nature and the environment.

Birding Optics
Articles on how to choose and use them, comparison charts of top brands, and how they work.

Binocular Basics
A great intro to binoculars and how they work, with particular emphasis on use for astronomy.

Nikon
Information on a range of binoculars and scopes from a well known manufacturer of imaging products, optics and lenses.