From the new SupportBlogging! website:
Educational Blogging is blogging by students, teachers, administrators, industry experts, and other involved entities that focus primarily on the educational process and educational interests.
In the context of the SupportBlogging! website, we focus primarily on the use of blogging as an educational tool that teachers introduce to their students, then use as a means of promoting learning. One of the great educational benefits of the read/write web, and blogging particularly, is the opportunity for the student to become a "teacher" by presenting material to an audience. When we teach, we learn.
Another benefit to educational blogging (and wiki-writing) is the opportunity for the student to find a personal "voice" and to develop individual interests. Much like journal-writing, blogging gives wings to ideas that otherwise may can stay trapped in the mind. Many individuals find that blog-writing changes their lives in a significant way by allowing them to express their ideas in a medium that appears to have life and longevity--and that might find a kindred audience.
It is not expected that all students will take to blogging (just as not all students enjoy writing), but it is believed that blogging has a unique ability to create enthusiasm for writing and the communication of ideas.