Ann Hanlon and Marisa Ramirez have self-archived their presentation "Asking for Permission: A Survey of Copyright Workflows for Institutional Repositories" in DigitalCommons@CalPoly.
Here's an excerpt:
Most survey respondents reported providing mediated deposit (material is deposited on behalf of the author by a third party, usually someone associated with the IR), whether it is completely mediated by the library or whether the author, in partnership with the library, deposits their work. The only respondents to report author self-deposit as the primary method of IR deposit were in Australia and Europe.