CAS as general single sign on solution for Internet app

[David Pratt]

Hi. I am generally familiar with the use of CAS authentication for the 
intranets. As such I had not properly considered it for a larger 
Internet application. Can or should CAS be used in the wild for internet 
applications as single sign on?

Overall, OpenID is emerging in this area as a potential generic 
standard. Despite this, I would welcome any insight in using CAS for a 
larger scale web application for Internet authentication. All the 
largest providers like Google, Yahoo, Microsoft all have their own brand 
of authentication - but the mechanisms are very CAS-like.

If it can be used, anything things to watch out for, or anyone already 
doing this that can shed light on how it may be working. Any links to 
documents or blogs articles as reference would be appreciated. No lack 
of information on general mechanism of CAS on Google, just anything 
specific about using it as Internet single sign on. Many thanks.

Regards
David