Wisc-Online, developed by faculty form the Wisconsin Technical College System (WTCS) is a "digital library of Web-based learning resources called 'learning objects'." Categories include Business, General Education, Health, Professional Development, Service and Technical, with sub-categories under each.
AH recommended this library of learning objects, also drawing attention to the "game builder area," in which you can create an account and save favorites which can later be compiled to resource lists.