The AskERIC gopher has resources for teachers at all grade levels.
The University of California at San Diego has a collection of lesson plans.
The US National K12 Gopher has lesson plans.
The Ralph Bunche School in New York has its own gopher! Here you will find interesting examples of student projects.
If you work in the area of early childhood you may find some interesting items in the University of California at Davis Early Childhood Laboratory
This Arizona State University gopher will lead you to lots of resources for teachers K-12
This University of Maryland gopher has subject matter for a variety of areas.
You may find useful content within the pages of books whose full text has been placed on the Internet. Please note that books may or may not contain content appropriate for students at your age and grade level