Below are professional organizations that have excellent resources for teachers.
National Council of Teachers of English
http://www.ncte.org/
Association of Middle Level Education - formerly National Middle School Association
http://amle.org/
ASCD
http://ascd.org/Default.aspx
National Writing Project
http://www.nwp.org/
European League of Middle Level Education
http://elmle.org/
Global Teacher Education .org
http://www.globalteachereducation.org/