Create a blog.
Blogger - A free, simple to use, site for creating and hosting a blog using drag-and-drop elements. Premium features available.
EduBlogs - The world's most popular educational blogging service, EduBlogs helps you easily create and manage student and teacher blogs. Premium features available.
KidBlog - This site provides a safe and secure academic blogging community where teachers maintain control of the students' accounts and blogs.
Posterous - Share anything you want on your on Space. This is a great site to use with group blogging!
Teacher Blog It - Create and manage blogs for all of your students with this free, ad-free site. Content can be public or private. Very easy to use!
Weebly - Great site for creating simple websites and blogs. Utilizes drag-and-drop features, but also offers you the option of deeper customization by using HTML/CSS coding. Premium features available.
WordPress - A free blog site that allows up to 35 users, lots of free features, 3GB of storage, continuous auto-save, group blogs with multiple authors, privacy options, and more! Premium features available.