I have now started a site at http://trailfire.com/annearendt/trailview/82529?q=opencourseware to keep track of OCW resources.
Older list of resources:
Massachusetts Institute of Technology OCW,
Johns Hopkins Bloomberg School of Public Health OCW,
Carnegie Mellon OpenLearningInitiative,
Tufts University OCW,
University of California, Berkeley,
University of California - Irvine,
University of Massachusetts Boston,
University of Norte Dame OCW,
Utah State University OCW
among others nationally and globally (Opencourseware Consortium, 2008; OpenCourseWare Finder, 2008).
There are other initiatives as well that combine resources from various institutions such as Sharing of Free Intellectual Assets (Sofia) and Multimedia Educational Resource for Learning and Online Teaching (Merlot).