Three Approaches to Blogging

One of my favorite bloggers, Richard Byrne, just posted a blog, "Three Approaches to Blogging," on his famous blog Free Technology for Teachers.

image: headers on http://www.freetech4teachers.com/

In this post,  "Three Approaches to Blogging," Byrne outlines the benefits of blogging, its varied uses, and its potential for reaching a wide or varied audience. Do you believe teachers should maintain blogs? Do you have one? If you don't, would you consider having one for your students as an audience or for the parents of your students to read? With what points that Byrne makes, do you agree?