Best Web Sites for K-12 @http://www.mhhe.com/socscience/education/k12.html
Atomic Learning @http://www.atomiclearning.com/
Kathy Schrock's Guide for Educators @http://www.kathyschrock.com/
Puzzlemaker @ http://www.puzzlemaker.com/
NCREL (Learning Through Technology) @http://www.ncrel.org/
Teachers.net (Lessons, curriculum, etc.) @ http://teachers.net/
ALA: Library and book resources http://www.ala.org/