Here are a few sites that I visit from time to time that are worth a look and hold a wealth of information.

www.luminous-landscape.com

www.photo.net

www.dpreview.com

www.earthboundlight.com

www.acecam.com

www.doubleexposure.com

www.fredmiranda.com

www.PhotoFriday.com/calibrate.php ~ monitor calibration

www.photonotes.org

www.johnpaulcaponigro.com

www.takegreatpictures.com

www.photoimaging.com.au