Law Librarian blog post: Orphan Works: A Statement of Best Practices links to the report (PDF) from the Society of American Archivists.
There is another post about this on a July 22, 2009 post at the Library Law blog: At last! Guidance for users of Orphan Works
(And while you’re at that blog, don’t miss Peter Hirtle’s July 5, 2009 post on: They Myth of the pre-1923 Public Domain)