Ok, so as I have discovered I too can create and use blogs in education. Prior to the readings I didn't realize the amount of critical reading involved. I can see the value in this. If a student is expected to reply to a blog or create their own, then they need to know their stuff. It is like a mini-persuasive essay each time. This is much more beneficial than just filling out a written response to a question.
I am eager to see more about how to use this in my class.
I found the following site to be useful
http://awd.cl.uh.edu/blog/ It is a compilation of the use of blogs in education and covers a WIDE range of curriculums (and not just one teacher's adventure in blogging).