Here are some of my favorite links:

Canon Digital Photography Forums
http://photography-on-the.net/forum/index.php

This Week in Photography
http://twipphoto.com/

Digital Photography Review
http://www.dpreview.com/

Cameratown
http://www.cameratown.com/

National Association of Photoshop Professionals (NAPP)
http://www.photoshopuser.com/