Core Knowledge Lesson Plans and Units: Wealth of lesson plans in all subject areas; Units are organized by grade level, and within grade level by subject area; click on the links on the left-hand side of the page to begin browsing

Discovery School Lesson Plans Library: Internet-rooted lesson plans that are organized by grade level and subject area.

Education World: Lesson Plans (organized by subject located in left hand menu), Educational Site Reviews, and more

EdHelper.com: Dedicated to providing teachers a single shop for educational resources

Lesson Plan Page Language Arts Lesson PLans, Ideas, and Activities: Over 3,500+ lesson plans

Lesson PlanZ: A searchable directory of free online lesson plans and lesson plan resources for all grades and subjects.

Microsoft Technology Education Lesson Plans:Technology-rich lesson plans that are searchable by title, grade level, subjects

National Geographic Geography Lessons and Activities: Find multimedia activities aligned with national standards, educational projects, and more.

Scholastic Lesson Plans: Lesson plans, activities, reproducibles, thematic units: Organized by grade level and subject

SeussDude.com: A guide to Dr. Seuss books, movies, board games, and lesson plans

TeAchnology: 30,000+ lesson plans

Teacher Vision: 20,000 pages of classroom-ready lesson plans, printables, and resources.

Teacher's Corner: Lesson plans on every subject; Also features thematic units; Seasonal ideas

Teachers.net: +4295 Free Lesson Plans

Teacher Planet: Lesson Plans for Teachers; Free Newsletter

Thinkfinity: Lesson Plans, Interactives, and More

Web-Integrated Lesson Plans