Websites which offer educational services and materials:

Business and Money

Computer Science and Engineering

Google Code University(external link)

YouTube EDU(external link)

English and Communications

Multiple Subjects and Miscellaneous

Connexions(external link)

MoMA’S MODERN TEACHERS(external link)

PBS Teachers(external link)

Science and Health

Engineer Guy(external link)

Harvard Medical School Open Courseware(external link)

HowStuffWorks Science(external link)

Khan Academy(external link)

MIT OpenCourseWare(external link)

Tufts OpenCourseWare(external link)

Open Yale Courses(external link)