Blogs are online diaries, or web logs, that are interesting to read and share, providing the topics have value to you.  It is easy to start your own, but it takes time.  Some teachers even have student blogs.  

As you explore blogs and their possibilities, be careful.  And remember, the quality of these links is uneven and the content strays.

About:  Web Logs, Education Blogs 
Web log basics and links

Blogs for Educators 

Blogs in Education 
Getting started 

Blogsavvy 
Free blog space

EdBlogger Praxis 
Large blog listing site

Google's Education Blogs
Nice selections, but uneven quality

I am a Teacher 
 
Kathy Schrock’s Educational Technology Blog Listing

Middle School Diaries 
 
The Top 20 Edu Blogs!? 

Yahoo's Education Blogs