Of the numerous sites I visit, Jörg Colberg's blog Conscientious is the most consistently interesting. Focusing on photography, Jörg also provides smart takes on other arts, politics, and life in general. His demeanor is never heavy handed and often times funny while remaining insightful.
Today, Conscientious is five years old and it's still as fresh as when it began. If you've never visited, I can't recommend it enough.