Read Write Think
NCTE and IRA work together to provide educators and students with access to the highest quality practices and resources in reading and language arts instruction through free, Internet-based content.
TeachersFirst.com
A collection of original content, Internet resources, and lesson plans, grouped by subject and grade level for ease of searching.
Education World
edhelper.com
Limited access unless a paid subscriber.
Kathy Schrock's Guide for Educators
Kathy Schrock's Guide for Educators is a categorized list of sites useful for enhancing curriculum and professional growth. It is updated often to include the best sites for teaching and learning.
ProTeacher
Source for lesson plans, theme units, classroom management, etc.
OOPS (Our Overnight Planning)