Apple USA is now running a free hosting service for universities and colleges allowing them to make educational content available for download 24/7.
The new iTunes U service has been trialled for a while but is now live and being used by, among others, Stanford University and the place where it all all looks to have started - the University of Michigan School of Dentistry.
Stanford currently has available over 400 tracks and these can be downloaded by anyone, not just students or academic staff - which doesn't seem to be the case with UMSD.