The Apple
 where teachers meet and learn.

ASCD Edge a professional networking community for educators.

Classroom 2.0
 Steve Hargadon's popular social networking site for educators.

Discovery Education tech tools and trend for teachers. 

Education Blogs by Discipline place to list subject-specific P-12-oriented blogs that are worth sharing with others

Eledblog.com
 a place for educators to gather, share and learn.

Educate Interactive
 an educational community with opportunities to connect, collaborate and share resources, lessons, and best practices.

Learning.now a blog from PBS Teachers that explores how new technology and Internet culture affect how educators teach and children learn.

NextGen Teachers
 educators connecting to explore the next generation of teaching and learning.

TeachAde
 an online community for teachers.

Teachers Recess
 a social network developed to provide everyday teaching solutions.

The Thinking Stick a blog by an administrator interested in leadership and preparing students for an unknown future.