Educators often ask me how I would recommend evaluating blogs. Below are posts from two well-respected Edublogging colleagues of mine that address the question and a few other resources I have found.
Evaluating Blogs - David Warlick
School blog best practices from Teacher to Principal - Techomnivore
Find out your blog's readability level at SMOG - G. Harry McLaughlin
Blog Rubric from Marta Valle - See the rubric a New York City teacher is using with her students