We have just launched our new blog system, available to Gold and Platinum members. I personally mainly blog in the Bo & JRP talk section of our main blog. I will though write here as well.
I also highly enjoy reading Martin Joergensen's blog. If you have not listened to his podcast "On Location", I strongly recommend you to do so, full of good tips and tricks. Latest two episodes dealing with HDR photography. Oh, by the way: Nikonians famous "Image Doctors" podcasters, Rick Walker and Jason Odell now have their own blogs as well. If you are interested in getting down & dirty with serious, amateur photography, these are gold nuggets.