I would assume that most anyone on this site has heard of OpenCourseWare. It is a brilliant idea and only helps to expand and envigorate human knowledge and advancement. But, for those who have not heard of OCW, a good place to start are the MIT Courses. If MIT isn't your 'cup 'o tea' there are many other universities and colleges offering on-line education for no cost. You may have to find some external resources that may compliment a course. For example: the MIT Classics in Western Philosophy course requires Classics of Philosophy by Louis P. Pojman. But, the texts included in the Classics of Philosophy compilation can be found, in full, and on-line using a handful of sources (a simple google search is usually all that is necessary).

Provided below are links to some institutions providing OCW courses and classes:

MIT : http://ocw.mit.edu/OcwWeb/index.htm

U of California : http://ocw.uci.edu/

U of Notre Dame : http://ocw.nd.edu/

There are, of course, many other colleges and universities in several countries offering this service. Many of them can be found by browsing the OCW Consortium website: http://www.ocwconsortium.org/index.html

A list of OCW Consortium member colleges and universities can be found here: http://www.ocwconsortium.org/about/members.shtml

Please enjoy and learn and help others know how accessible knowledge can be.