Yale University Courses (free)
Playlists of full lecture series for dozens of courses.
Departments with content here include:
Ecology and Evolutionary Biology
History of Art
Italian Language and Literature
Molecular, Cellular and Developmental Biology
See also the Open Yale Courses web site, which opens with:
"Open Yale Courses provides free and open access to a selection of introductory courses taught by distinguished teachers and scholars at Yale University. The aim of the project is to expand access to educational materials for all who wish to learn."
The lectures are also available on iTunes U.