Although I like the idea of using a blogs in my classroom, I think that this may sometimes be unnecessary. Many times teachers are not familiar with the technology needed to be able to make a blog and might spend precious time working on one. There is no time to waste when teaching,that time can be used in more important things like in preparing lessons or class activities. Although it is very important for the student to know how to use a computer it is also important for them to have good thinking and social skills something they are not able to get from a computer.
Overall I think that a blog could be very useful in upper grade levels, were the students are able to work more independently without the aid of the teacher. Another good use for a blog can be to inform the parents of lower level students.