We've changed the Shibboleth Service Provider registration process. You can now make requests and changes online at https://idms-web.oit.duke.edu/spreg/sps. Changes are processed automatically and available quickly.
There's updated documentation at https://wiki.duke.edu/display/OITSHIB.
If you need access to an existing IdP or have questions about the process, contact firstname.lastname@example.org.