I don't know how new or groundbreaking photoblogs are for readers, but as a working professional photographer I find mine to be a valuable venue to try out experiments, or show personal work (in my case, really personal work), or just air pieces that I've done that clients might be too timid to publish. I think, just as "normal" blogs, they're probably an intermediate evolution in the publishing paradigm, a transition from editor-mediated publishing to a direct creator-consumer relationship. At the very least they represent a handy way to share my artist's sketchbook with readers who want something a little more "raw" and direct.
You can check mine out at dailysiege.com. Sorry, standard warnings: free reg. req., try bugmenot.com, and most definitely not safe for work, or for kiddies.