Tom Fury believes you need these lightning rods on your blogroll.
500px
This remarkable community provides an exciting resource for exhibiting and sharing the best work of a new generation of photographers.
Art Renewal Center
This extraordinary online museum features most of the greatest works of art from all ages. The mission statement and associated essays about what is and isn’t art are provocative, but well-argued. With a comprehensive offering of educational materials, scholarships, competitions, exhibitions, and discussion groups, this site is one of the Web’s crown jewels.
Flickr
Yes, everyone knows about this one, but the fact remains that this is the biggest and best image commons online.
Liam’s Pictures From Old Books
A large repository of beautifully-scanned and precisely-cataloged images from old books. This is an amazing work of scholarship and love.
Shorpy Historic Photo Archive
This vintage photo blog features thousands of high-definition and meticulously restored images from the 1850s to 1950s. (Be sure to abide by this site’s the terms of use.)