The Office of Overseas Schools offers fact sheets on all of the international schools supported by the Department of State, as well as useful links related to education.
The Overseas Briefing Center's publication Foreign Service Assignment Notebook: What Do I Do Now? contains a helpful chapter on "Education for Foreign Service Children."
The Family Liaison Office Education and Youth Issues page includes an online version of the book-length publication Education Options for the Foreign Service Family Member, as well as information on adult education, boarding school, homeschooling, scholarships, and much more.
To research Washington, DC area education options, check OBC's Returning to Washington page or the Family Liaison Office information on Washington Area Schools.