A few days ago I talked about "free" open source courseware.
Did you know MIT (Massachusetts Institute of Technology) offers these. They call it their OCW program.
They actually have 1800 such courses from management, science, engineering, architecture and planning, physics, Algebra, Biology, principles of microeconomics and so many more.
If interested, begin here: http://ocw.mit.edu/OcwWeb/web/home/home/index.htm
They have a few writing courses, like "Writing About Race" and "Advanced Essay Workshop." They are listed under "special programs" http://ocw.mit.edu/OcwWeb/Special-Programs/index.htm