Blogs
A blog (a portmanteau of web log) is a website where entries are commonly displayed in reverse chronological order. "Blog" can also be used as a verb, meaning to maintain or add content to a blog. (from Wikipedia)


Edublogs You can safely blog with students at Edublogs. You can moderate their posts easily and manage their accounts.
http://pbwiki.com/education.wiki PB Wiki has ad-free Wikis too.
http://macul.edublogs.org/ This is our Blog from the MACUL conference.
http://www.aasl.ala.org/aaslblog AASL Blog (American Association School Librarians)