Here are some of the Links that we frequent:

Shutter Point -http://www.shutterpoint.com/

Photo.Net -http://photo.net/

Pro Fotos - http://profotos.com/

Photo Links- http://www.photolinks.com/

Photography Sites -http://www.photographysites.com/

Top Photography Sites -
http://www.topphotographers.com/in.php?id=kloeppho