If you use iTunes U, then you have probably ran across the "publishing the course dilemma." To publish a course is a two step process that starts with the author of the course. The author must make a request to add his/her course to the iTunes U Catalog, then the Site Manager can add the course to the institutions iTunes U Catalog in the iTunes Store. It is one of those cumbersome little tasks that only needs to be done once in a while and is easily forgotten until the next time it comes up. The screen shot should help, at least until the next time the UI is changed.