College & Research Libraries has released an preprint of "Do Open Access Electronic Theses and Dissertations Diminish Publishing Opportunities in the Social Sciences and Humanities?"
Here's an excerpt:
An increasing number of higher education institutions worldwide are requiring submission of electronic theses and dissertations (ETDs) by graduate students and are subsequently providing open access to these works in online repositories. Faculty advisors and graduate students are concerned that such unfiltered access to their work could diminish future publishing opportunities. This study investigated social sciences, arts and humanities journal editors' and university press directors' attitudes toward ETDs. The findings indicate that manuscripts which are revisions of openly accessible ETDs are always welcome for submission or considered on a case by case basis by 82.8% of journal editors and 53.7% of university press directors polled.