Are you more interested in blogs about photography, i.e. word blogs, or are you looking for photoblogs that feature photos? For the later, you can look at photoblog specific sites like
http://www.photoblogs.org/ and
http://www.coolphotoblogs.com/. For the former, I generally rely on links from blogs and recommendations from others.
To add to your list, I would add:
http://www.pixelatedimage.com/blog/,
http://www.scottkelby.com/, and
http://www.moosenewsblog.com/.