This video presentation by Andrew Petro is a brief overview of Jasig's Central Authentication Service (CAS) single sign-on open source project. Please check out http://www.unicon.net/opensource/cas to learn more about Unicon's services for CAS.
Also, check out the Jasig Sakai 2012 Conference presentation on Jasig CAS 3.5 at: https://wiki.jasig.org/display/JCON/2...