I found this wonderful resource that focuses in on the educational aspects of blogging in the classroom and thought I would share it with you. The site is called SupportBlogging (of course) and it is a Wiki site. It provides many resources, best practices and information that seems both practical and thought-provoking.
This is a nice summary of how blogs can be integrated into the classroom:
In a broader and more educational system, blogs are about communicating. You observe your experience, reflect on it, and then write about it. Other people read your reflections, respond from their perspectives by commenting or writing their own blog article. You read their perspectives, often learn something through their eyes, and write some more.
— from Supportblogging