Blogging is used as an interactive means of learning and has many benefits. It creates discussion within the peer community that would otherwise not take place. Students feel free to share their ideas and brain storming often occurs as a result of this. Blogging enhances the students knowledge and it can also strengthen community. Perhaps the biggest advantage of blogging is it gives the students some control over their own learning experience. Blogs can help create a feeling of student-centered teaching.
Of course, there are negative sides to blogging and when it should not be used in teaching such as it is just one more venue for some people to spout off and it is one more place where we have to read. Other then that...
I just can't find any.