University of Regina (Canada)
University of Regina: Math Central: Lessons and Units
This is a searchable database of lesson plans and units in all strands of Mathematics, from elementary to secondary.
Yale University
Yale New Haven Teachers Institute: Curriculum Units (1978 Present)
A collection of volumes of curriculum materials, organized by year, that were developed by teachers and cover a wide range of topics in science, social studies, language arts, math, etc. Each volume focuses on an over-riding theme or...