National Council for the Social Studies
http://www.ncss.org
This site is one of those MUST HAVES for social studies teachers. Contains a wide range of social studies resources.

Kathy Schrock's Guide for Educators
http://school.discovery.com/schrockguide/
An amazing collection of information. An award winning site appropriate for teachers of all grade levels and subject areas.

Daryl Cagle's Professional Cartoonist Index
http://www.cagle.com
This site has an amazing array of editorial/political cartoons from the U.S. and many other countries in the world. Lesson plans, games, etc. are available to teachers.

History Channel
http://www.historychannel.com
An excellent site for current history programming and many useful resources and links.

Online Newspapers from the U.S. and the World
http://www.ecola.com
Hundreds of online newspapers from throughout the United States and all over the world. An outstanding resource for social studies teachers.