Whether it's Edublogs or WPMU or just plain old Wordpress, there's no easier way for teachers to have an online presence. Set up an account. Log in. Click "Write". Paste or type in what you have to say. Click "Publish." Welcome to the read/write/web.

The fact that it's a blog makes it extendable. So they can easily do some online discussions and podcasting, and posting of pictures galleries, and interaction with other classrooms in the blogosphere, and whatever else they want to do. But they don't have to. Because it's easy to get started with it, and it's powerful enough to grow with the teacher as her needs evolve, it merits inclusion on this list.