Peregrine's Bird Blog (with an incredibly inclusive list of bird photographers' sites from around the world.)
Arthur Morris: Birds as Art
Moose Peterson's Wildlife Research Photography
Laurence Poh (Malaysia)
Harold Stiver Photography
Nigel Blake Photography (UK)
Brian Small Photo
North American Birds Photo Gallery (Peter LaTourrette)
Mike Danzenbaker's Bird Photography
Brandon Holden Photography (Ontario)
Birds of Manitoba (Ann Cook)
Mike McDowell (Wisconsin)
Sharon Brown Photography
Green-backed Heron (Kent Nickell, Iowa)
South Dakota Birds (Terry Sohl, South Dakota)
Crossleybirds.com (Richard Crossley, Cape May, NJ)
Martin Reid (TX)
Tim Avery (UT, WI)
Nature Images by CLE (Carol Edwards, Ontario)
San Juan Wildlife & Nature Photography (Matt Ragen)
Glenn Walbek (Colorado)
Tony Leukering (Colorado)
RedStart Images avian photography (Ernesto Scott)
Gary Luhm Photography (Seattle, WA)
Carol Blackard Photography