Blogging in the Classroom

I am really excited to start a blog in my classroom, but I'm not sure yet how I want to get started. I looked at some sample blogs from Blogs and Blogging on our class site. Mrs. Schmidt has a great blog that seems like it would be very effective for parent communication, but she doesn't seem to have her students comment on her blog. Mrs. Alaniz has a more student-friendly blog, but her students don't seem to reply to many of her posts.

I think I would like to use my blog with students instead of just parent communication, but maybe it would be better to start by using to to just share information since it is new to me? I began setting up a blog on kidblog. It seems really easy to use so far. I'm not sure if I should have my students create their own blogs or just have them log in to the class page to comment on posts. Does anyone know how that works or have suggestions for blogging with fourth graders?