Educational Resource

I came across MIT's OpenCourseWare site today, and though I haven't perused it to any degree, I thought it might be of interest to some readers here. From their home page:

Welcome to MIT's OpenCourseWare:
a free and open educational resource (OER) for educators, students, and self-learners around the world.

MIT OCW:

Is a publication of MIT course materials
Does not require any registration
Is not a degree-granting or certificate-granting activity
Does not provide access to MIT faculty