photography references
While not a “course” per se, Luminous Landscape has a number of very good tutorials, techniques, understanding series, and essays. I highly recommend that you take a look at this site, http://luminous-landscape.com/. Thom Hogan also has some interesting articles, http://www.bythom.com/nikon.htm.
Some other online sites you can checkout are,
Short Courses, http://www.shortcourses.com/
Cambridge In Color – tutorials, http://www.cambridgeincolour.com/tutorials.htm
Digital Photography FAQ, http://www.cs.duke.edu/~parr/photography/faq.html.
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Brooks
http://photo-seminars.com/Campus.htm