All documents related to how Portland Public Schools organizes and teaches their Social Studies classes. Good for referring to for planning your own units and lesson plans.
Teacher's Curriculum Institute (TCI) in my opinion is the premier Social Studies Publishing Company. From their website you can access free 30 day trials of resources, teaching SS philosophy, some free lessons, and great beginning of the year class set-up ideas.
"A video library for K-12 teachers; 29 half-hour and 3 one-hour video programs, library guide, and Web site" Teacher resources and development across curriculum.
Very detailed and comprehensive set of lessons, resources and all materials related to teaching geography concepts, vocabulary, and skills from the ground up for the Middle School level.