Collaborative Lesson Archive - http://faldo.atmos.uiuc.edu/CLA - This site provides a searchable database by subject, title, grade level (preK to undergraduate), and other Internet resources.  

edHelper - http://www.edhelper.com - This site provides lesson plans, WebQuests, free worksheet generators, word and critical thinking problems, exams and puzzles.  

Apple Learning Interchange - http://ali.apple.com/ali - Large portal created for educators.  

Cyber Guides - http://www.sdcoe.k12.ca.us/score/cy912.html - Standards-based, web-delivered units of instruction centered on core works of literature.  

Gateway Education Materials - http://www.thegateway.org - A collection of searchable lesson plans, curriculum units and other education resources on the Internet.  
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Educator's Referemce Desk - http://www.eduref.org - Lesson plans arranged by subjects and topics K-12.  

Columbia Education Center - http://www.col-ed.org/cur - Lessons listed by grade level for language arts, mathematics, science, and social studies. 

Marc Sheehan's Lesson Plans Page - http://www.halcyon.com/marcs/lessons.html - A teacher's site with lesson plans for grades K-4, links to other sites offering lesson plans, and other Internet resources. 

Teachers' guide to the Professional Cartoonists -  http://www.cagle.com/teacher - Lesson plans for k-12 teachers in social studies, English and art based around a collection of newspaper editorial cartoons. 

NETS Database of Lesson Plans - http://cnets.iste.org/search/s_search.html - A collection of lesson plans and larger units of study that integrate technology into various curricular areas, from kindergarten through twelfth grade. 

Teachnet - http://www.teachnet.org/ - A nationwide, non-profit education organization that networks innovative teachers who exhibit professionalism and creativity within public school systems. It also provides grants and fellowships in the areas of curriculum, leadership, policy, and new media.