Free Online Blog (Weblog) Creation Tools

David Warlick's ClassBlogmeister

Google's Blogger

Edublogs.org

Bloglines

LiveJournal

Tumblr 

Weebly - free website builder / blog site

Webs.com - free website builder/blog site

Sauropol - free website builder/ blog site

WriteToMyBlog - Free Web word processor for typing blog entries

Wiki about blogging from Tracy's other workshop

SchoolRack

Great list of blogging resources: 50 Useful Blogging Resources for Teachers