It doesn't matter when the bell rings, students can learn 24-7

These teachers have been using blogs in thier classroom in Frederick County, Md.

Check out this link :
Web Logs are the New Bulletin Boards

This has plenty of great examples of why blogs are useful to a K-12 Classroom. Students blogged their reaction to a field trip, displayed art projects, showed mathematical solutions, and gave feedback to the teacher quickly. I am enamored by the fact that they are low maintenance and that students will put more work into an idea because they it will be read by the teacher as well as their peers. Also, students mormally quiet in the class will come alive with a keyboard.

Here is another website giving great ideas about classroom blogging.
PBS Teachersource

Some teachers believe it is a good idea to leave the post anonymous. I'm not sure I agree with that, but it might be useful if problems were to arise. Discussing literature on blogs vs. in class would be much better in higher grade levels. Many more ideas could develop about symbolism, themes, etc. There are listed several programs that can be used to blog and links to useful websites. I love the idea of Summer Reading Blogs. That way you will know the student is comprehending the material and that they are actually doing the assignments.
Here is the man that taught me so much about reading and probably inspired me to be a teacher.I'm sure Levar Burton is pro-Blog.
Reading Rainbow was the Schiznit back in the day!
(Yes I am aware that I am a huge nerd).