This article by Michael Saporito, Access Services Librarian at the Boston Social Law Library, discusses the new co-operation scheme which has been established by two leading law libraries to exploit their document delivery schemes for the mutual benefit of their clients.Preprint of an article by Michael Saporito, Access Services Librarian at Boston Social Law Library and Visiting Librarian at the Institute of Advanced Legal Studies Library, published in Legal Information Management, the journal of the British and Irish Association of Law Librarians.