I think this web log thing is pretty neat, because it lets the students express their opinions on things that were taught in class. They might have had have a different opinion or expectation on the subject. It is good because they can post ideas, likes and dislikes questions.
It is very essential for the teacher's to know what their students think about their class topic and it can give them an idea on what to do different for the next topic. The teacher's have a full advantage in engaging this in their classroom as a requirement.
I would use web log in my class, if I were to teach a higher level than what I want to but it is a good idea to include it in a teacher's curriculum.