The Luminous Landscape
The best photography site.
Cambridge in Color
Excellent theory of photography site. Need a recap on technical concepts? Look no further!
Great camera, lenses, gear, ... review site. The focus is on Canon gear.
Latest Canon related news and rumors.
The CMS used for this site. What I like about it is the clean designs and the integration with Lightroom.
B&H explora & YouTube channel
An amazing source for excellent video tutorials spreading from the artistic to the technical. I especially recommend the recordings from the OPTIC 2015 conference. I am going to buy soooo much stuff from B&H the next time I'm visiting New York to thank them for this... :)