American Ornithological Society

American Birding Association

Audubon Naturalist Society

Audubon Society

Cornell Laboratory of Ornithology

eBird

American Bird Conservancy

The Internet Bird Collection

Handbook of Birds of the World (subscription; no financial connection)

Birding Pals around the world.

Bird Song Mnemonics 1

Bird Song Mnemonics 2

Some Selected Birding Areas

Awesome Birding Database (but then I wrote it, so I'm biased. Filemaker Pro database template)

   My Flickr Photography

Montgomery Bird Club (Montgomery County, Maryland)

Maryland Ornithological Society

Maryland and D.C. Birding Discussions

Latest Montgomery County, Maryland Sightings

Bob Augustine Birding Hints

Some of the Montgomery County non-passerine and passerine birds I have photographerd.