I also enjoyed Mark's Edtech Blog: Is this SSR 2.0? I really like the concept of letting students do some of their sustained silent reading time online, and it would be a great teaser to get them wanting to do their own commenting! Because I'm such a book lover, I couldn't give up every SSR block for students to read blogs, but I know they would love it! I especially see the benefits of students reading kid-written blogs. They would yearn to join the blogging community!
Blog reading reminds me of my magazine/newspaper reading or Internet searches. I skim and scan and preview different areas until I find something that peaks my interest. Then that reading may lead me down yet another path. I don't necessarily start the blog and read from top to bottom in it's entirety. When I'm reading a novel, I read every word and wouldn't DREAM of skipping around and skimming anything! I want every detail and in order! So, I guess what I'm saying is that my blog reading is similar to other informative reading searches, but not the same as narrative readings.
As far as blogging facilitating learning, I think the above two links are great examples of how we can encourage students join the blogging community. I'm sure the applications for facilitating classroom learning are limitless! I know I'm just beginning to get my toes wet in the ocean of possibilities out there!