Sorry for this very late update, but I got frustrated with the slowness of the new Forum!!
We are still trying to figure out Shibboleth with Weblogic 11g and Apex. We have CAS authentication working with Listener 2.0.2 but we need to get authorization from Shibb which is supposed to be a 'flavor' of SAML 2 to work with Apex.
The following have been very helpful: