Teachers Teaching Teachers
http://www.teachersteachingteachers.org/
This website maintains links to the audio for talks given at EdTechTalk. They are intended to educate and enlighten teachers about some of the issues facing education today.
Edutopia
http://www.edutopia.org/blogs
Maintained by the George Lucas Educational Foundation and written by a number of teachers, this blog provides posts on a wide variety of topics surrounding education. Posts can be searched by topic, grade level, or other factors.
The Learning Network
http://learning.blogs.nytimes.com/
This is a blog that pairs content from the New York Times with education. Blog entries refer to NYT articles and then ask questions of the readers. These may be informational or may request students' opinions. There are also contests sometimes and very lively interaction in the comments. This can be a great starting place for a lesson plan, or it can be a chance for students to learn and practice responsible internet interaction.