Thom Hogan's extensive information about (Nikon) photographic equipment, Digital and 35mm SLR eBooks
http://www.bythom.com
Dry Creek Photo's excellent colour profiling service and digital imaging
resources for photographers by
photographers, including a brief to colour-managed workflow and free profiles
for you local minilab
http://www.drycreekphoto.com
Norman Koren's most comprehensive information on different aspects of digital
darkroom
http://www.normankoren.com
and his digital benchmark for
testing the sharpness and image quality of lenses, digital cameras, digitized
film images and printers
http://www.imatest.com
David Coffin's free Raw Digital Photo Decoding in Linux - pieces of it are
used in RAWMagick Lite to decode raw digital camera images
http://www.cybercom.net/..