That's not quite accurate, but "free MIT educational materials" is quite accurate. The MIT OpenCourseWare program (OCW) places course materials from a huge number of MIT courses on the web for free download by anyone. Some of the 1700 courses even include video lectures and demonstrations (e.g., Physics I: Classical Mechanics).
There are dozens of courses I would like to explore and study if I only had the time. I have heard that these materials are used all over the world to teach real college courses, while students, teachers, and enthusiasts everywhere use the materials to supplement their studies in various ways. It's really pretty amazing that all this stuff is out there.
One excellent improvement is that many (all?) of the courses have a direct download feature. This is a zip file that contains all the materials structured into folders that follow the on-line web structure for the course. Simply unzip with "use folder names" to preserve the folder structure, and you've got it all in convenient local form. Of particular interest to astronomy and space enthusiasts are the following courses I just downloaded to check out:
Introduction to Astronomy (12.402J, spring 2006)
The Solar System (12.400, spring 2006)
Hands-On Astronomy: Observing Stars and Planets (12.409, spring 2002)
Note that while there are many readings, worksheets, and other materials in PDF or XML form, there is still quite often a text or other book(s) required for assigned readings, and these are not (in general) on line.
P.S. In addition to the interesting comment added about other sources of free science learning materials, I stumbled on The Stingy Scholar who posted in March 2007 about some of the top MIT OCW courses. Your mileage may vary, of course, but at least there are reasons for the choices- see here and here ("turnkey" courses with no need for a textbook etc.). "Stingy" also discovered Orbiter.