In case you like blogging and think it has potential in YOUR classroom but don't know how to do it, here are some examples of good educational weblogs, compiled by Will Richardson:
Galileo Web--The starting point for exporation of Pat's school site. I've highlighted a couple below, but spend some time clicking through the "Tech Integration Links" in the left column. Really well done stuff.
Developing Writers--This is a great example at Pat's school of how to use a Weblog to provide articulation materials for teachers. I wish my school would jump on this idea more, have Expository Composition teachers, for example, create a site that provides instructional materials, rubrics and models for the different essay genres they teach.
Ms. Chiang--Teaching Chinese with a blog. Nice example of class portal and materials/homework archive. More examples here.
The National Writing Project Blog Project also lists some educational uses of Weblogs on various levels. (See the "Tour of WP Blogs" in the left column.) Some highlights:
The Sequoia Sentinel--The homepage for the Sequoia School site.
IHMS 103--A beautiful middle school site with lots of student writing and feedback. We use this model at our school as well.
Hidden Histories-- A collaborative blog between two sixth grade classrooms 300 miles apart.
East Side Bloggers--High school bloggers in every grade. Try the "sort by students" drop down to get the scope of what they're doing.
