Individual instructors are distributing course materials on the Web. A partial listing is given at the World Lecture Hall . This is a good first stop to get an appreciation for the variety of courses and the diversity in presentation style and format. Courses listed at the World Lecture Hall are nominated by their developers and thus represent a biased sample. About twice a year I use V.J. Ansfields' Directory of U.S. and Canadian Geology Departments and literally poke around the pages being produced.
Many departments publish a page of courses with Internet resources.
Given the procedure for locating these resources, these lists clearly are incomplete. However, as the same search procedures have been used for more than 5 years, the following graphics give a sense of the rate of growth of this use of the Internet in the geosciences. Note that the number of courses is increasing at a greater rate than number of departments. In many departments there appears to be one individual who continues to add course resources over time. In at least one case support for development is provided by an organization.