"The Gateway expands educators' capability to access Internet-based lesson plans, instructional units and other educational materials in all forms and formats. The Gateway's goal is to improve the organization and accessibility of the substantial collections of materials that are already available on various federal, state, university, non-profit, and commercial Internet sites to educators and learners.Access is free to users; consortium members pay a fee to make their records available to Gateway. Gateway then standardizes the metadata and adds elements to enhance access to the resources by K-12 teachers, their targeted user group.
The Gateway is a nonprofit consortium membership organization serving educators and trainers at all levels in the USA and around the world."
The Gateway organization was formerly GEM, a USDoE-funded school library project designed to develop content, technology and data standards for K-12 education. The project has been funded by the National Educational Association since 2005 and is now known as The Gateway.
Some cool resources easily findable through Gateway:
Two Unreconciled Strivings: African-American Identity in the Gilded Age, 1877-1915
On Becoming a Certified Backyard Wildlife Habitat
Court Documents Related to Martin Luther King, Jr., and Memphis Sanitation Workers: A NARA Teaching with Documents Lesson Plan