Husband-and-wife professors at Yale law school (she gave us the "Tiger Mother" debate) publish book about why some racial and ethnic groups are more successful than others. And no, it's not because they value education.
There is some evidence that young scholars could hurt their chances at publication by posting dissertations online, but also concerns that lengthy embargoes could hurt scholarship and fail to recognize changes wrought by the Internet.
American Historical Association wants universities to permit blocking of online access to doctoral students' work for six years, saying such rules will protect new Ph.D.s seeking to publish. Not everyone wants to be protected.