• Nature Photographers Network
• PhotoLinks (art photographers)
• Photographic Society of America.
• PhotoKB.com (clubs, forums, etc.)

Magazines, Books, and Online Guides:

• Amphoto Books (plus other publishers)
• Camera Arts
• Digital Capture Magazine (paper version free)
• Digital Photography Review
• The Digital Journalist
• Element K Journals (Photoshop, Illustrator, design, etc.)
• ephotozine (British)
• HTMLgoodies.com (tutorials)
• Layers Magazine (Adobe)
• Phaidon Press
• Shutterbug
• photographyREVIEW.com
• Popular Photography
• Shaw Guides
• Wildlife & Nature Photography (book reviews, etc.)

Equipment and Film Manufactuers:

• Bogen (tripods, flashes)
• Canon
• Casio
• Epson (printers, scanners)
• Fuji Photo Film
• Hoya (filters)
• Kodak
• Lee Filters
• Lowepro (protective cases)
• Mamiya
• Minolta
• Nikon
• Olympus
• Pentax
• Sigma (lens, cameras)
• Tamrac (protective cases)

Imagery Software Manufacturers:

• ACD Systems (FotoCanvas)
• Adobe (Photoshop, Elements, etc.)
• ArcSoft (PhotoStudio)
• Corel (Picture Publisher, Bryce)
• Deneba (Canvas)
• Jasc (Paint Shop Pro)
• MGI (PhotoSuite)
• Microsoft (Picture It!)
• Ron Scott (QFX)
• Satori (PhotoXL)
• Ulead (PhotoImpact)

Schools and Institutes:

• Brooks Institute
• Cortona Center of Photography (Italy)
• George DeWolfe Correspondance Workshops
• Hallmark Institute of Photography
• New York Institute of Photography
• Nikon School
• Rocky Mountain School of Photography
• Santa Fe Workshops
• Society for Photographic Education

Centers, Museums, and Fine Photo Webs:

• Birds as Art (Arthur Morris)
• Center for Photographic Art
• The Center For Photography at Woodstock
• Houston Center for Photography
• International Center of Photography (Manhattan)
• San Francisco Camerawork
• ShutterCity.com

Links to retailers are for your convenience and not endorsements.

Retailers
(mostly New York):

• A&M Photo World
• Abe's of Maine (actually, of Brooklyn)
• Adorama
• B&H
• Beach Camera
• Broadway Photo (Brooklyn again)
• CCI Camera City
• Calumet
• Camera World
• The Camera Zone
• Digitalfoto Discount Club
• The Film Shop (more than film)
• Focuscamera.com
• Hubcast
• Hunt's Photo & Video
• KEH Camera Brokers
• Marine Park Cameras & Electronics
• Penn Camera (Nikon specialist)
• Regency Camera
• Samy's Camera
• Sunshine Color Labs
• Tristate Camera & Video

Repair, Rental, Scanning, and Other Services (mostly Manhattan):

• Essex Camera Service (repair, Carlstadt, NJ)
• Foto Care (equipment rental)
• Imagers (scanning, Atlanta, GA)
• Modernage (processing, scanning)
• Photo Tech (repair)
• Print Space Color Labs (212-255-1919; darkroom rental)

Photos & Travel Tour Operators:

• Adventure Photo Tours
• Barefoot Contessa Adventure Travel & Photo Workshop Tours
• Canyonlight Photo & Scenic Tours
• Great American Photography Weekends
• Joseph Van Os Photo Safaris
• Naturetrek
• Voyagers International

Technical Information Sources:

• Film Scanner Review
• MacWorld Reviews
• Photodo.com (odd & wonderful)