General digital photography sites

DPreview - Imaging-resource  - I-R lens reviews  - Phillip Reeve -  The Digital Picture (with lens comparator)
Luminous-Landscape - photo.net - FredMiranda - Juza Photo
NickyBay - Duade Paton on Youtube 

Hardware

Canon camera and lenses

Canon Camera Museum - EFlenses CanonUSA - Allphotolenses
Canon Rumours - Northern Light Canon Rumours

Lenses

Lens tests

Castleman lens reviews - OpticalLimits / Photozone.de - Westfall graphical of Photozone
16-9.net - Photodo - Cameralabs 
Sharpness with/without teleconverter - Oleg Kikin lens test links

dSLR Autofocus at >5.6 (or >8.0)

Shuttermuse -dlcphotography - FredMiranda - dpreview1 - dpreview2

Extreme lenses

Cyberphoto List of lenses in Swedish - 10 expensive -  Canon 400 mm f/2.0 prototype -
Petapixel Canon 300 mm f/1.8 - MarcoCavina Canon 300 mm f/1.8 - Petapixel  Zeiss 40 mm f/0.33 (trick) -

Fisheye lenses

The Fishlist

FD lenses and system

FD Lens Works 1986 by Christian Rollinger
Photo of Malaysia

Batteries

Imaging-resource NiMH comparison test
The Battery University
 

Software

Software lists

Techradar - Expert Photography -

RAW conversion

Capture One - On1 - 

Image editing

Gimp - Topaz Labs - NeatImage -

Correcting Distortion and Color Fringing 
Understanding image sharpness part 2: Resolution and MTF curves in scanners and sharpening by Norman Koren

Some panorama software

Microsoft ICE - Hugin

Scanning

A few scanning tips by Wayne Fulton