I found another interesting digital photography course online today.
http://openhighschoolcourses.org/mod/book/view.php?id=1720&chapterid=1225
Another interesting site
http://digitalartanddesign.org/
Photoshop Painting Tutorials 171 videos www.youtube.com/playlist?list=PL6SlOEu27fGcFxOf22Q3gfN1hfzsb4FMY