Talk about the different features of the new liferay version - awesome work on new integration of different security protocol- plugin with CAS, OpenID, SAML different SSO solutions …
SSO framework through the different tempo services - UI-FW, FormManager, Task Attachement (Alfresco), Feeds (Slightly modified)
Walk through all these: http://www.ja-sig.org/wiki/display/CAS/Proxy+CAS+Walkthrough