I'd recommend using one of the following services if you're interested in blogging with your students. They are both aimed at education blogging and don't require student emails in order to set up your class. KidBlog in particular also let's you determine how open or closed your student blogs are to the outside world.
- AHFoundations wiki from 2011-2012
- Brian Crosby class project wiki
- Lisa Parisi collection of project wikis
- AHF Let Freedom Ring wiki - 2012-2013 + ???
Video Part 1
Video Part 2