AskERIC Lesson Plans
http://www.askeric.org/Virtual/Lessons/
More than 2000 unique lesson plans from all over the United States and the world.

A to Z Teacher Stuff
http://www.atozteacherstuff.com/
Created for teachers by teachers.

Britannica Encyclopedia
http://www.britannica.com/
You don't need to log in to use the search box. Enter the phrase "lesson plans" (or any other keywords that interest you) in order to pull up a wealth of good information.

Columbia Education Center (CEC)
http://www.col-ed.org/index_lessons.html
Lesson plans by grade level and subject area.

Core Knowledge
http://www.coreknowledge.org/CKproto2/resrcs/
Lesson plans for elementary and middle school learners.

Discovery's Lesson Plans Library
http://school.discovery.com/lessonplans/
Hundreds of original lesson plans on a variety of topics, sorted according to age and grade level.

EdHelper
http://www.edhelper.com/
Lesson plans, webquests, worksheets, critical thinking problems, exams and puzzles.

Education Place, from Houghton Mifflin
http://www.eduplace.com/
Resources for teachers, students, and parents.

EFL4U.com
http://www.efl4u.com/
Over 160 downloadable lesson worksheets.

Encarta Schoolhouse
http://encarta.msn.com/guide/newschoolhouse.asp
Lesson plans from Encarta, an encyclopedia publisher.

Everything ESL
http://www.everythingesl.net/
Content-based lesson plans for ESL/EFL.

Internet TESL Journal (I-TESL-J), Lesson Plans
http://iteslj.org/Lessons/
Lesson plans for ESOL from Internet TESL Journal, organized by skill area.

It's Up To Us, HIV-AIDS Education, from Henry Lesnick
http://www.hostos.cuny.edu/homepages/lesnick/Aids/Default.htm
An AIDS Education Curriculum for ESL students and other English language.

LessonPlanZ.com
http://www.lessonplanz.com/
Lesson plans by grade level and by subject area.

Microsoft Lesson Connection
http://www.k12.msn.com/
A searchable collection of lesson plans.

National Clearinghouse for English Language Acquisition (NCELA)
http://www.ncela.gwu.edu/
A large repository of lesson plans, articles, and research for English language educators.

New York Times Learning Network
http://www.nytimes.com/learning/
Lesson plans based on current news topics for middle school level and higher.

Smithsonian
http://educate.si.edu/lp/lp_fs.html
Lesson plan ideas from Smithsonian.

Teach-Nology
http://www.teach-nology.com/teachers/lesson_plans/
Worksheets, rubrics (for evaluation and assessment), lesson plans, games, and tips.

Teacher Helpers
http://www.teacherhelpers.com/lesson_plans.html
Elementary school level lesson plans by subject and grade level.

TeacherLink
http://teacherlink.ed.usu.edu/TLresources/longterm/
Teaching resources in English from NASA that can be adapted to ESL/EFL settings.

TEFL.NET ESL, Worksheets
http://www.tefl.net/handouts/
Worksheets and handouts for EFL/ESL use in class.

U.S. Department of Education
http://www.ed.gov/index.jsp
Lesson plans by grade level and topic from the U.S. Department of Education.

American Teachers
http://www.americanteachers.com/lessonplans.cfm

Cool Teaching Units and Lessons
http://169.207.3.68/~rlevine/coolunits.htm

ESL Web Guide
http://www.eslcafe.com/search/Lesson_Plans/

LessonPlans.com
http://LessonPlans.com/

Sites for Teachers
http://www.sitesforteachers.com/